I'm paranoid as fuck so it's actually the opposite -- I go cop in neighborhoods way better than my own. I hate doing street/car deals but if I must, I will do it. I much prefer to be in someone's apartment. I know that's also risky but it gives me a sense of security for some reason. I don't like to deal with unknowns, either, so it's usually a friend of a friend and so forth.
Also, I live in a fairly shitty fucking neighborhood. My brother, girlfriend and I are pretty much the only white folks over here besides the annoying ass kids that go to a certain expensive ass University I won't name. My neighborhood used to be predominantly working class Irish Catholic with some Italians and Eastern European Jews mixed in (but what neighborhood in the Bronx wasn't?) The majority of the white folks left during the "white flight" to the suburbs in the late 70s/mid 80s, right around the time I was born. It's now mostly Hispanic folks (from various places, such as Puerto Rico or the Dominican Republic) with multiple children on some sort of public assistance as well as an influx of Indians, Koreans (who run neighborhood liquor stores or bodegas mostly) and Albanians (who usually do manual labor or else own "real estate"). The black folks who are here now are mostly from the Caribbean or else have been here just as long as me, perhaps longer. We've got everybody up here and everyone has a different game.
I probably wouldn't have to go further than the corner if I was interested in certain things, but alas I am not so there goes that idea. Everyone knows poverty causes people to push drugs and there are only a handful of hardcore users around here, mostly at the homeless outreach centers just a few blocks away. Again, it's that social stigma between the dealers who are hustling for a living as they mostly have felony records and no alternatives (who only smoke pot and drink 40s) and the straight up crack fiends/winos who can't get it together. You'll usually find them panhandling by the subway stations during rush hours and then at the crack spot, rinse, repeat, ad nauseam. It's gotten to the point where people are asking me for change (obviously for drugs) when I'm going to cop for myself. I love the irony. "Sorry, bro, gotta get myself well first."
It's weird because the cops over here sometimes seem suspicious of me but I've lived here my entire shitty existence. It even says so on my fucked-up ID with indentations from crushing my goddamn pills for snorting. :D
But back to the fucking topic.
When I'm copping on the street, I go in with the mentality that this is going to be "the time" and that if I want what I want, I have to accept that chance it could be "the time". It just comes with the territory. The scenario has played out in my head over and over. I agree that looking like you have a purpose works. Maybe a cheap prop camera... "Oh, officer, I'm doing a project on abandoned tenement buildings and graffiti artists for my Grandpa who loves the Celtics, did you see the game last night?"
OR, CONVERSELY, turn on some of that clueless white folk charm we all know and love. "Oh, officer, we were just looking for [popular nearby landmark/attraction]. Could you help us out with directions? I think we got off at the wrong subway stop and this neighborhood is kind of scary, do you have to walk around here at night?!"... It depends on the cops you encounter and how you present yourself. When I go to cop, unless desperate, I'm very clean cut and mild mannered, like I'm going to the library and shit.
With all of that said, I've been taken into custody 3 times, only one of which I actually had charges. The others were for truancy and being *with* someone who was shoplifting. (The cop who came even said, "If you have anything on you that you don't want to go to the station with, I suggest you dump it now" as they were cuffing my friend. I dumped a pack of cigarettes because I didn't want my parents to know I smoked, so stupid. I'd smoked/drank everything else prior to that.) This was back when I was 17 so nothing stuck and, after a year of probation, I have a clean record.
If all else fails, take enough of the benzo of your choice so that you're chill but not slurring or blacked out and fucking pray to the Patron Saint of Drug Users that the cops you encounter don't feel like doing paperwork that particular moment.

That's my fantastically long winded take on it. If you take enough precautions and go in with a strategy, you should be able to avoid getting busted but as with everything else in this life, you won't know till you're done copping and back at your apartment getting high and laughing about how paranoid you were.
Oh, or withdrawing in a jail cell.
