“You can’t get back on the horse if you haven’t fallen off it.” – Phil Dunphy, Modern Family
Overcoming your fear once, doing something difficult and daring the first time, is one thing. More difficult is giving that speech a second time, going back to the drawing board for a logo design, running a second half marathon.
The second time you don’t have the luxury of ignorance. Having heard all the external and (more likely) internal criticism, you still must decide to overcome your fears one more time.
If you want to master anything, though, you must get back on the horse.