Any Job Worth Doing Is Worth Doing Poorly!
Of course I don’t mean it (quite) the way it sounds—hey, I’m an obsessive-compulsive perfectionist.
But consider, relative to a big/big-ish project, not investing your energy in finishing up your current sub-project, then moving rote-like to the next step. Instead, start, in a half-assed way, two or three or four other tasks/sub-projects just to see how the overall thing feels and where it might go that’s unexpected based on three or four or five tasks in motion at the same time. In other words, just keep doin’ stuff—and see what the stuff you’ve done “feels like” on the whole. (There will be time for polish later.)
(For me, in working on a book, it can mean plunging into the next chapter before I even have a decent rough draft of the current chapter—when I have 4 or 5 or 8 or 9 half-assed chapter drafts in process I can begin to figure out what the book as a whole is actually about—or what it might be about that I hadn’t imagined.)