Practicing the piano has its hard days. It's just part of the gig.
Days where things are more challenging than normal. Days where notes just won't stick. Days where it just plain feels frustrating.
But it's better than being on the sidelines. The one not playing the game at all, because of quitting or never starting to begin with.
The one who will never play the piano.
It's the same of any endeavor.
Writing a book is hard. But even on a writer's darkest days, at least the writer gets to play the game.
It's better than being on the sidelines - the person who will never consider the possibility of writing a book.
Remember. No matter how hard today is. At least you get to play. It's much better than watching from the sidelines.