Dry fire practice
When I used to practice a lot, I would unload my gun, usually a revolver or 1911, and practice on an old TV set. As the images would come on the set, I would try to hold on target, do a correct trigger press, and try to snap before the face left the screen, normally a second or two. The object being to get through the trigger squeeze, effectively, in the least amount of time.
When I go to the range to shoot revolvers these days, I place a round or two in the cylinder, and some empties, and practice the "ball & dummy" drill. Every time I pull the trigger, it will go snap, or bang, but I never know which. This is an effective tool to get you to recognize anticipation and flinching problems, and overcome them. I open the cylinder every time, and turn it some, STOP IT, and close it, not looking to see if the next will be loaded or not. I may practice for half an hour, firing as little as 6 rounds, so that's kind of a dry fire practice.