Shoot neighboor, shoot everyone from neighboors roof.It's best to just hang low. Go around town begging like everyone else. Eat your stashed food at night. The minute you shoot one of these bastards, they'll burn your house down while you sleep.
Be the grey man. Grow your beard and wear dirty clothes. If you think you are going to shoot everyone that knocks on your door, you aren't going to last long. You'll probably last less time then them.