I think the steps I've taken to hide digital stuff from my SO and protect myself while out mongering can be conceived as a little bit over the top but it works.
I am in the IT industry so I have the advantage of having access to many things the average monger doesn't.
Internet browsing/e-mail:
I have a Microsoft Exchange 2010 server running at my house. I created an account on this server that I use for signing up to things (such as this site, etc.). The email goes into my server and it gets archived (saved to another journal account) and then it gets directly forwarded to one of my 3 gmail accounts so I can confirm, then get's deleted from gmail. If I ever need to see the email again I can pull up the archive on my email server. I also have 3 seperate gmail accounts. 1 I use as the forwarding account for my email account I host at home, another I use if I'm signing up to bullshit sites (basically a mongering SPAM account) and the 3rd is an account I use to respond to NP4P ads and such. All 3 email accounts use usernames and passwords that I do not use anywhere else. I also have setup a virtual machine on my server that runs Windows 7 pro. I use this specifically to check my email accounts and browse UG, BP and CL for mongering things. I simply remote into it use Remote Desktop, or if I'm not home I have Team Viewer installed on it for remote access. I do absolutely ZERO mongering things on my laptop or desktop at the house, I strictly use the virtual machine (which I am using to type this). I also maintain all my routers and switches so I'm the only one who see's the logs, so no worrying about prying eyes finding and IP address and running a WHOIS request on it.
Phones:
I have an iPhone as my daily, and a cheap Verizon flip as my mongering phone. If I am away from a computer I have no problem using my iPhone to browse BP/UG/CL. I also am not worried about my SO looking through for phone because 1) even if she does use it she doesn't use the browser I use to browse those things. I keep my mongering phone in my coat in a pocket she doesn't check, and since my coat is always on me I figured it's the best way to know it's safe. I also have come up with a bunch of excuses if she happens to stumble upon it, all of which are very plausible. Now, about that mongering phone; I picked up cheap VZW Samsung flip phone for $15 from walmart. Phone came preloaded with $10 in call credit. Obviously this was a cash transaction. I like the idea of having a cheap phone like this because if I have to toss it there's no monetary attachment. I also have the google voice app installed on my iPhone for mongering in a pinch if I don't have my second phone on me (dont take my coat, leave it at work, etc). I clear the history after I use it and she won't check my google voice so it's win win.
in call locations - Parking and getting to them:
If you are going to an AMP or in call session in an area you are unfamiliar with you should do yourself a favor and Google Map the address and use Satellite View to get an idea of the surroundings. Always look for alternate places to park, and alternate routes out to main roads using side streets. Another trick I do is when I get to an in call location such as a Motel/hotel, I will scout out/drive around the location BEFORE I call the provider to tell them I am there; sometimes I will just sit in the parking lot for 10min before calling just to see if I spot any movement/suspicious activity. I will also look for movement AFTER I make the call; anything the tiniest bit sketchy and I'm out. I've bailed on 2 providers due to a bad vibe from the parking lot. ALSO, if you use a GPS navigation unit CLEAR YOUR HISTORY. This should be a no brainer. Me personally, I use one of the 4 GPS nav apps I have on my iphone to guide me to in call locations.
Picking in call escorts:
This part I learned from wasting time and hard earned money. First thing I do when I see an ad for an escort I like is I google the phone number. If there's no other escort/mongering related results besides the ad the provider posted, I pass. Second thing I do is I search for the provider on UG and other well known sites to look for reviews. Anyone who is reviewed on this site or other reputable ones is drastically less likely to be LE. Also, I cannot stand wasting money like I have in the past on piss poor providers, so seeing other people's experiences allows me to decide if I want to go or not. I will TOFTT if I'm really into a provider (or really horny), but I do feel more comfortable if I see some feedback. Another thing I like to do is if an escort gives off a vibe like they may be a snitch, see if they've recently posted in other counties. Chances are if they move between counties (Queens, nassau, suffolk, North Jersey, etc.) they aren't a rat. LE agencies aren't wasting money on joint operations to nail mongers getting some side pussy.
Once inside in call location:
One thing I do is I DO NOT discuss anything once in the room. The only 3 things I care about I ask when setting up the appointment (Whats the donations for your time, how many pops for the hour, are you gfe). I DO NOT make any moves until the provider starts to disrobe, and I also will try and disrobe at the same time to make them comfortable that I am not LE. At that point I still do not discuss anything until after my dick is in her mouth or pussy. I do not trust scumbag LEO's to not stoop to new lows to make a case, especially in this corrupt ass county (Nassau).
Other general tips:
If you do not have a common name, make one up. I am lucky in that my first name is one of the most common male names, so I don't need to make one up because if you use my first name and my physical description LE will come up with a shit ton of results. No need to give them anymore info then needed. Also, pick one name and give it to all providers so you don't get caught or mixed up.
Don't be rude/nasty. There's no reason to be rude to providers due to bad service, or bad attitude. You are still engaging in an illegal activity and as such you should cover your own ass. This means at AMPs if you are not happy with the service, don't tip; don't do what this one guy did at an AMP I was at earlier last month did and sit there an argue with 2 workers for over an hour because you are unhappy. Suck up the fact you lost money, don't tip, leave, write a bad review, and don't come back. Same goes with escorts. Don't give them any reason to do anything in retaliation for being treated like shit. I was with a terrible provider and didn't enjoy the session at all, but I still said "Thank you" and "bye" when I left very nicely.
Don't fool yourself. These girls are in it to get money, and we are in it to pay them to give us pussy. I've watched too many people fall victim to hookers and strippers leading them on and just extorting money out of them one load at a time.
I've only been mongering for a few months but I'm no stranger to NP4P/side pussy and having to cover my ass.