Natalie Meg Evans
Is simply to get going and write that first book, shortstory, play or whatever you aim to do. If you're anything like me, that first piece of work is likely to be the one where you make all your mistakes. But you're going to have to make them, so you might as well get it over with.
Don't take years and years over this first piece. Give yourself a realistic deadline, say nine months. Then jump in and don't stop till you type 'The End.' Be kind to yourself too. Never say, 'I can't do it' or 'I'm not good enough.' Very few people are good enough when they start. It's practice that makes a great writer.