When I first started, my teacher was very strict when it came to position play. On other words, he really pushed me to get 'correct' and as perfect as I possibly could on every shot. So, I had a habit of trying to force some of my position play in situations where I should have 'laid back' and settled for a tougher shot and trusted my pocketing abilities. When I learned to trust my pocketing and to quit taking extra risk in order to get perfect on every shot, I stopped hooking myself so often, reduced my scratches, and generally increased my 'out' rate.
dave