I would recommend sighting in with a buddy. Have your buddy load you weapon one shot at a time. Have him leave the gun empty at different times so you never know if the rifle will fire or not. Have him watch and ctitique your style. He should be able to see if/when you flinch. You should always take a short breath and hold it just before pulling the trigger. Also, when your sights are on target, you should gently pull that trigger in such a way that you are not sure exactly when it will fire.

Good Luck!