Learning and practicing how to correctly pull the trigger is probably the single biggest improvement to accuracy a new shooter can make. The difference between the right way, and the way everyone is born doing it, particularly with pistols, is HUGE. And it does take practice.
> Because bullets travel much faster than arrows, a gunner can aim in a straight line, which is easy.
Outside of being right next to your target, knowing your bullet drop and compensating for it is absolutely a part of shooting.