You shoot best breathing out and squeezing the trigger. I shot expert. 200 meters without any scope I could help you find Jesus very fast. Prone position is great as you can shift about 30 degrees and cover quite a bit of battlefield.
We used to practice by shoving a pencil in the end of the M16-A2 or A1 and balancing a nickel $0.05 USD coin on the #2 pencil. You practiced sighting and you also would fire without knocking the coin off.
I could teach anyone to shoot well.
Ironically I have zero handgun skills. I never did the pistol work. I called in Artillery and I shot M60 and M16.