There is some kind of fuzzy line between confidence, bravado, and being a hack.
No, practice is not a waste of time for me. That's why I know how to operate a safety without two hands. Ruger American, Tikka T3, Model 700, Model 70, Model 77, Model 760/7600. I have them all and shoot them all, and can make them all quiet when I need to.
My point was, if the buck hears my safety, it's too late for him.