If you are serious about practice, get a "blue gun" that matches (as closely as possible) your real one.
My blue guns have taken numerous falls that my real ones would have had to endure. This is especially important when trying out holsters or practicing the draw. And since the blue (or red) guns are a hard plastic, it's easy to modify them to more closely match your gun. In each case, I used a needle file to open up a rear sight notch, so I could actually get a decent sight picture. My S&W Model 60-NY has a bobbed hammer spur, so I sawed it off on the blue gun, too.
I've also taken some tips from friends who know some things about oriental martial arts. Mental training can be done at any time, any place. Your mind can always picture the perfect draw, perfect sight alignment, perfect follow-on, perfect immediate action drill.
Another method of practice is to do everything as slowly as possible, being aware of everything that is happening, and what should happen next. Everything is designed to strengthen the neural pathways that will take over, and make everything seem instinctual, in a real-life stress situation. You're working to purposely build instinct. And that should include instinctive safe gun handling.
A final training aid I learned from my father. Watch movies and TV shows, see how many safety errors are committed. Then watch "reality" cop shows, and see what you get when you give someone a taxpayer-supplied badge and gun.