I shoot r e a l well. One way to get a grasp of how not to fire a handgun etc, is to watch a closeup of someone firing a blackpowder weapon on a DVD movie. Run the firing in slow mo. You ll see, more likely than not- a closing of the eyes well before firing, . Notice the grip! The hand will collectivelly close, squeezing the weapon causing excessive movement. Eratic breathing etc.
Yeah yeah. Just a movie. However, it is a good way to observe how not to do it, in turn taking a closer look at one s own shoot posture. Perhaps revealling a negative aspect previously not realized.