Another safety tip: Use a dedicated room for dry fire practice. If you don't have a room to use (i.e., you live in a studio apartment), at least have a dedicated area. And in this dedicated room/area, no live ammo is allowed while dry firing, only snap caps. I also make frequent checks to make sure I only have snap caps.

Even with this precaution, pay attention to where the muzzle is pointed. Use a safe backstop, even if it's just boxes filled with books, for example. There are kevlar dry fire "targets" available for this purpose.

Lastly, and this may sound funny, but when I'm done with my dry fire practice and I reload my carry/self defense gun, I say out loud, "This gun is loaded" three times. I find it helps me "reset" my mind that the gun is loaded.