Write! And don't be afraid to write imperfect prose. Your first draft will suck. Big time. "Fear of sucking" kept me from even beginning my first draft for many months. Then, when I'd written my first paragraph, I spent several more months attempting to perfect it. Guess what? By the time I finished my final draft, that paragraph was cut! The lesson here? Write. Don't focus too much on what you wrote before--keep moving forward. Revise and edit later!