When I need writerly advice, I go to the experts. (I really should have these words of wisdom tattoed on my arm...)
The worst enemy to creativity is self-doubt. ~Sylvia Plath
I'm not a very good writer, but I'm an excellent rewriter. ~James Michener
The wastebasket is a writer's best friend. ~Isaac Bashevis Singer
If my doctor told me I had only six minutes to live, I wouldn't brood. I'd type a little faster. ~Isaac Asimov
A synonym is a word you use when you can't spell the other one. ~Baltasar Gracián
I asked Ring Lardner the other day how he writes his short stories, and he said he wrote a few widely separated words or phrases on a piece of paper and then went back and filled in the spaces. ~Harold Ross
Writing comes more easily if you have something to say. ~Sholem Asch
The best time for planning a book is while you're doing the dishes. ~Agatha Christie
The road to hell is paved with adverbs. ~Stephen King
It is plagiarism when you take something out of a book and use it as your own. If you take it out of several books then it is research. ~ Ralph Foss
It is impossible to discourage the real writers - they don't give a damn what you say, they're going to write. ~Sinclair Lewis
And finally...from William Safire
Do not put statements in the negative form.
And don't start sentences with a conjunction.
If you reread your work, you will find on rereading that a great deal of repetition can be avoided by rereading and editing.
Never use a long word when a diminutive one will do.
Unqualified superlatives are the worst of all.
Proofread carefully to see if you any words out.
If any word is improper at the end of a sentence, a linking verb is.
Avoid trendy locutions that sound flaky.
Last, but not least, avoid cliches like the plague.
~William Safire, "Great Rules of Writing"