The scariest moment is always before you start.
Stephen King
Your book may be in the form of a finished draft, scattered notes, a journal, audio files, or a single thought on an otherwise blank page. Look for an editor who can appreciate your voice and who can give you a plan to move your work forward.
Pianta.org
Why use an editor?
An editor can listen, read, edit, comment, fix only what needs fixing, and encourage. At any stage, whether you have a completed draft or just an idea, an experienced editor can help.
Editing, Books, and Music