Finding peace with failure in advance

I have been watching Storror videos, and love one of the mental pointers they use:

Find peace with failure in advance.

In this video, they are doing a slightly scary challenge that involves falling into the water if they fail, and one of the ways they prepare is by mentally finding peace with falling into the water. That helps remove their mental struggle with failure, and it makes it possible for them to perform with less distraction from the fear.

This is an example of using our areas of passion as a laboratory. Any area of life that we delve into deeply becomes a kind of laboratory for life.

In this case, they realize that finding peace with failure in advance helps them perform to the best of their ability. They share the pointer with others watching their videos. And they and the viewers can then apply that pointer to other areas of our own life.

In what area(s) of life am I afraid of life? What specifically am I afraid of? How is it to find peace with that fear of failure here and now? What changes when I find peace with failure in advance?