Some of it is bound to be shitty…
Actually, that's a lie. Most of it is bound to be shitty.
What's "it"? Your product, your creation, your art.
Spend an hour a day writing for 40 days and you'll probably have 39 days worth of what Anne Lamott calls "the shitty draft."
Don't do it for the 39, though. Do it for the one.
If it takes 40 days to get that single painting right then so be it.
Art isn't time-bound. Creativity has no day planner. We just get to create and pray the Muses look affectionately upon us in that moment.
Stop trying to be perfect, just create.