A very good book for writers - worth the read if you haven't read it already. This article presents some of the best quotes from the book:
Stephen King’s 20 Tips for Becoming a Frighteningly Good Writer
I particularly like: "Try any goddam thing you like, no matter how boringly normal or outrageous. If it works, fine. If it doesn’t, toss it." I think that ends up being the answer to all the "can I" or "should I" questions, even though as writers I think we sometimes chafe at such general (and obvious) knowledge.