Buy a guy a beer, he'll show you around
I traveled alone to Juarez for my 1st Bullfight. Being 6'3" and 220lbs, I guess I felt comfortable doing that, walking around, at night, by myself, and talking to strangers.
Never had any problems, though I guess I wouldn't recommend it.
I met Ray here, and he took me around to a few bars, etc. there's plenty of people around who will show you the ropes, for very little compensation, just use your best judgement.