Or, in other words - you need to learn how to pace your stresses and over time you’ll couch yourself to a person who’s capable of handling stress better.
I am a very sensitive person, nevertheless it took me years to learn how to do big leaps; and while at first I believed the only way forward for me were those “revolutionary, yet incredibly painful steps”, I had then reached an age when I could no longer progress in larger, rarer chunks.
So I learnt that I need to pace my pushes. It still is a cut each time, but I had to know how big that cut can be so that it would not be an irrecoverable wound.
Remember, none of those people jumped off a cliff to stop fearing heights. Neither have they worked out in a situation with a vitamin deficiency. It’s all healthy and psychological.