Lisa J. Crane
First, sit down and write. It sounds over-simplified, but a lot of people go through life thinking, "I could do that." Then they reach the end and say, "I should've done that." So do it.
Second, find a critique group you feel comfortable with and join it. For the most part, other writers want to help you be the best writer you can be. You may think your writing is already 'good enough', but is that what you want?