I was looking at Mel Gibson in "The Patriot" a few nights ago, and he said something that is so applicable to pool--"Aim small. Miss small." It is so important to really zero in on the smallest point on the object ball that you can manage.
One of the things that Max Eberle points out in his excellent e-book Zen Pool (weren't they talking about Zen and pool earlier in this thread?) is that to properly play position, you must play the object ball into a particular part of the pocket. It can be the middle of the pocket or it could be one side or another, but it must be a precise point. The particular point where the cue ball contacts the object ball, after all, determines the tangent line and the initial cueball path from which all position play flows.
Even on the most routine of shots, by aiming for a precise point, you will be induced to give your full attention to the task at hand. The bonus is that even if you don't hit the particular part of the pocket that you had targeted, your chances of making the ball will still be much greater than if you had just aimed for the pocket as a whole.
Aim small. Miss small. Miss less.