Write with purpose in mind. Edit with purpose in mind. Polish with purpose in mind. Use it as your criterion for chopping (or lack of it) and gauge your satisfaction against it. When 100% of your words are charged with meaning, your book is done.
You can juggle fiction and nonfiction writing in your career, but you'll need organization, diligence, and the ingenuity to recognize how to give each skill set its proper time, place, and respect in your writing life.
It’s the start of the new year – and it's finally time to write the book you've been thinking about. Except, you're not even sure how to start writing a book. If you dedicate yourself to the task, you can finish your book within a year.