I started out, as a kid, by reading everything I could get my hands on about guns, all sorts of gun magazines, an old copy of "Fast and Fancy Revolver Shooting", etc. I also asked my neighbor and his fellow State Troopers an endless number of questions, which they patiently answered. When I went shooting for the first time my Dad had my neighbor go along and observe me. He told my Dad I started out good enough to pass a police revolver qualification.
I got really good at revolver shooting thanks to an old guy, Al, at my gun club. He was retired, and spent every day shooting two five pound coffee cans full of .38 reloads thru his S&W and Taurus 4" revolvers. I used to go the range twice a week, and when I used up my box of .38 ammo he let me shoot as much of his as I wanted in exchange for my empty brass. He also gave pointers on shooting a K frame service revolver. By the time I actually qualified for my first agency, shooting a double action revolver was second nature to me.