If you find yourself dwelling over the ball on your putts, a little tentative about pulling the trigger then give this exercise a go.
Set up to the ball, line yourself up, and then begin to count backwards from 50 to 1. So once you have lined up your ball, start counting, 50, 49, 48 and so on. This will give your mind something to focus on while your body plays the stroke. It will hopefully stop you doubting your stroke as you make it.