It is the hardest.
The first word of an article. The first show we put on. The first time we try something new. The reason it's the hardest isn't because of writing that word, organizing the show, or signing up to try something new, but rather the vulnerability of embracing an experience that might not work, playing the show without an audience, or writing a bad story.
But the first is valuable.
Once we have done it, we can either learn to improve it or completely change it to serve better.
With the first, we stop hiding, and can then do the second, the third, and so on.