Make sure you have the same grip every time. Pay attention to your front sight, that's where it all happens. Slowly squeeeeeeze the trigger straight back. Let the shot surprise you.
And by the way, that's already pretty fair shooting.
If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen. ― Samuel Adams