It's not even executing it fearlessly.
It's not even shipping it to the world generously.
The most difficult part is quieting this inner voice which tells you "you're not supposed to" just long enough for you to do your work again.
The answer is not to fight this voice, not to reason with it, not to engage in counterarguments of why you should do it. Because the more you speak back to this voice, the more it feeds on the discussion.
The secret lies in this: Only do it.
[HT to Leon for the link]
PS My organ improvisation recital on the excerpts of the four-part poem "The Season" by Kristijonas Donelaitis (1714-1780): "The Joys of Spring", "the Labors of Summer", "the Goods of Autumn", and "the Worries of Winter".