Shooting, like tieing your laces and riding a bike, is controlled by the subconsious, once you have done a lot of it.
So what is your consious mind doing while breakng the shot????
It is supposed to be focused on giving useful instructions to the subconsious, not listening to the guys beside you; wondering about dinner, etc.
The care and feeding of the subconsious is important. First, it cannot process a negative command. If you think "Don't jerk the trigger," this gets processed as "#*&^$%@$^&** jerk the trigger."
Dogs are the same way. If you say "Sorry, I have no more cookies", all Rover hears is "$%&&%^$#$#@%$^&& cookies."
I use a specific chant to keep extranious thoughts out of my mind. I think "Perfect shot in the middle. Perfect shot in the middle. Perfect shot in the middle. Perfect shot in the middle. " Each time I think this, I mentally picture a bullet passing though the dead centre of the bull. The subconsious then takes this command and does all the things to break a perfect shot.
What do uou think a pro golpher is thinking when he putts or drives?
When you practice, you must practice with perfect technique. Otherwise you get good at shooting poorly.
For example, you eye will burn in an image in 6 seconds. Look at the TV or out the window for 10 seconds, then look away and blink your eyes. You will see the image. If you concentrate on a sight picture for more than 6 seconds you lose the ability to clearly see aiming errors. So as you deep breath , wiggle and get ready for the shot, don't stare at the target. Do that last, and quickly.
A shooting coach can teach you good fundementals and a sports psychologist can teach you how to focus you brain.