Write whenever you can. Each time you write you grow. Remember one thing. You will never be completely happy with your book. I have a friend who wrote a book 3 years ago. He keeps editing it, thinking that its not good enough. Just put it up there! Take some constructive criticism. No book can have all 5 stars. Accept your mistakes move on! No kicking yourself! Remember, anything you write, your grandchildren will read someday.