Here's some excellent advice from a good shooter :
+1 Steve M1911A1
"I recently read something that immediately made me say, "Yes! Of course."
The thesis was that your trigger technique is much more important than your sighting technique. Your eyes will "automatically" take care of the sighting process, but you have to train your body, hands, and trigger finger to properly press (not "squeeze") the trigger. "Sighting errors" are almost always due to faulty trigger control!
The trigger of any gun—rifle, pistol, or shotgun—should be pressed straight back. Any sideways, upwards, or downwards pressure will cause an inaccurate shot. Further, the press should be smooth, not jerky or intentionally quick.
Work on your trigger press. Your eyes will take care of themselves."
I fully agree with this point of view.
Take a look at "wheel" image toward the bottom of this page. Finger placement is the key, but also how you stroke the trigger.
I hope this helps