PD James: Don’t just plan to writeâ€”write. It is only by writing, not dreaming about it, that we develop our own style.
Steven Pressfield: The answer: plunge in.
Anne Enright: Keep putting words on the page.
Joyce Carol Oates: I have forced myself to begin writing when I’ve been utterly exhausted…
Cory Doctorow: Write even when the world is chaotic.
Hilary Mantel: If you get stuck, get away from your desk. Take a walk, take a bath, go to sleep, make a pie, draw, listen to music, meditate, exercise; whatever you do, don’t just stick there scowling at the problem. But don’t make telephone calls or go to a party; if you do, other people’s words will pour in where your lost words should be.
Helen Dunmore: Finish the day’s writing when you still want to continue.
Geoff Dyer: Have more than one idea on the go at any one time. If it’s a choice between writing a book and doing nothing I will always choose the latter. It’s only if I have an idea for two books that I choose one rather than the other. I always have to feel that I’m bunking off from something.
Jennifer Egan: [Be] willing to write really badly. It won’t hurt you to do that.
Sarah Waters: Treat writing as a job. Be disciplined.
Joshua Wolf Shenk: Get through a draft as quickly as possible.
Maryn McKenna: Find an organizational scheme for your notes and materials; keep up with it (if you are transcribing sound files or notebooks, donâ€™t let yourself fall behind); and be faithful to it…
Taken from 99%, where there are other pieces of good advice, including how to break up over your writing.