As many have said "it is practise, practise, practise".....!
Short story:
Started Cowboy Action Shooting in 1998, thinking I knew how to shoot and how difficult could this be? Five years later, in 2003, I realized that I had learned ALOT about shooting (speed and accuracy) - neither of which I was very proficient at. I took a break from the competitions in May of that year and just stayed at home and practised every other day on metal swinging metal targets about the size of a softball from 10 yards. 300 - 400 rounds night after night for 3 months. Never varied the distance, never bothered to vary the target size.
After two months I started backing up to 15 yards (was getting abit bored) and continued the last month for 45 feet. Must have shot over 13,000 rounds during that time. Returned to Shooting Matches in September of that year. Found out that I could hit any target that they put out there with my pistols.
Won my class in the next nine (9) Matches and comments were made that I must have attended some type of professional training.....Nope, just practised incessantly for 3 solid months.
Moral: anyone can do it if I did. I am not special in anyway whatsoever.
Secondly, many (especially guys) think they are good shots.....most are not. Cowboy Action Shooting will force you to use three (3) different guns: pistol, rifle and shotgun.....under pressure and at a multitude of varied targets. It simply taught me how to shoot, when I thought I already knew......!