The scariest putt in golf, for the right handed player, is I believe a three-footer or slightly less, left to right severe breaking putt on a fast green about 10 to 12 on the Stimpmeter.
The best way to handle this putt, is not to throw up your hands and think – or even say or shout — “Oh No!!!” but to calm down and follow the next four steps:
Read the putt carefully from both sides, and select a target point — even a severe break from this distance will not be very much more than a ball outside the left lip.
Make a few rhythmic practice strokes.
Align your set up with your toe line parallel to your target line
Get over the ball, TRUST your line and make a solid smooth stroke – don’t try to baby it in the hole — and keep your head still, eyes down and listen for the ball to drop – watching it will not help.