Ask any author and they will tell you that knowing when a book is finished can be one of the trickiest parts of writing anything. The finishing line is always characterised by endless revisions and it can be hard to figure out if you are still working on your manuscript or on a final version of your book.
Of course, there are some of those moments that you know for sure- when you are done chewing all the sugar out of the story, it is usually a sign that you are done. When you run out of ideas, it is always better to move on to the next thing rather than waste time trying to come up with ideas that are simply not working. The good news is that you can always come back to that idea later and refine it.
A writer is pretty much done with a manuscript when he or she cannot figure out any possible way to make it better. The manuscript is also never done until your editor says it’s done. If you are still struggling, here are some tips that can help:
Trust the process
If you find that your mind is no longer giving you ideas to further the book, then it is usually a sign that you are done. If your story was still incomplete, the thought of it would bug and bother you until you figured it out. As such, if this is not happening to you, then move on to the next project or hand it in to your editor.
Pass it on
Before you decide that your book is done, pass it on to your family members or other author friends to see if they can tweak it. Be careful not to pass it on to too many individuals because everyone will have an opinion. If the corrections that have been sent to you are not enriching your storyline or text, then your book is probably ready.
Let it sit
Even if you are sure that your book is complete, keep it with you for a few weeks before reading it again. After three weeks or so, revisit the manuscript and read it with fresh eyes. If you still have nothing new to add, then that should be a good sign to let you know that you have completed the writing process.
All in all, it all boils down to following your instincts. If you feel good about sharing it; it is clear that you are ready to call your agent.