As others have said, your question is somewhat broad. But I will relate a funny story.
As most people here know, it is critical to pause in the set position--aiming is done, tip is at the cueball, body is in place, gaze is switched to the target area, and you're ready to pull the trigger on the business stroke.
What most people don't know is just how hard it is to get students to do this, particularly students who have been playing a long time. We've tried one-mississippi..two-mississippi... We've tried standing over them and telling they cant pull the trigger until we say so. We've tried showing them videos of SVB shooting and having them time his set pause and then also having them time the set pauses--if they exist at all-- of the bangers out at the pool tables.
Once an hour has passed and they've eaten a cheeseburger or checked facebook, the pause is short again --frustrating.
So here was the solution in the class we taught a few weeks ago. We required all eight of them, when they got into the set position, to relax their minds and their muscles and recite outloud the following mantra:
"My Name in Iningo Montoya; You killed my father; Prepare to die."
So far this is the first group of students who collectively have OWNED the set pause...