After all of those grueling hours of work you have finally finished your first phase of book, writing, and it’s really good. Your story is now one step closer to being read by people all around the world. But for now, just sit back and relax for a while because the next phase is editing everything.
I strongly suggest you to ask a professional editor for this step because editing is just as important as writing, but even in this case, it would be better to self-edit to prevent sending a manuscript full of mistakes to your editor. The cleaner your manuscript is before sending to editor, the less you will pay and less time will be spent by the editor fixing small grammatical and punctual errors.