TELL YOURSELF FINISH IT OFF!
To make short putts, practise committing to your target. Try this drill: (1) Find a flat two-footer on the practice green, and stick a tee in the far edge of the cup. (2) Address the ball, and aim your putterface at the tee. Be very precise. Even have a friend check it. (3) After a while, take the tee away and pick a target, like a blade of grass, on the back of the cup. Stroke to that spot. On the course, tell yourself something positive, like Finish it off!