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:
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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.
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Make a few rhythmic practice strokes.
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Align your set up with your toe line parallel to your target line
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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.
franklygolf 
I’ve been scared a number of times in my life, however, I have never been scared standing over a putt. A putt is a putt.
I’m sort of a weirdo with respect to left to right putts. I like them and make more of them than right to lefters. I learned years ago that I could take a very high line and use the toe of the putter. I truly make probably 50% more left to right putts than right to left ones. Btw, I’m a natural lefthander who is right eye dominant, for whatever that’s worth.
Since I am a senior I don’t worry too much about missing golf shots, although I still try to be accurate. Lot’s more fun that way.
I missed 3 of those on different holes, different days, and ended with a double bogey. I will use Franks advice this week if I run into that one again. Doesn’t matter what the slope, Left to Right for a right hander, NOT EASY.
In order to be successful in any sporting activity you can’t play scared.
No PUTT scares me because I don’t keep score; I’m a senior and I by myself on a public golf course. If I miss a putt, so WHAT!!! who cares. Certainly NOT me.