When the time comes to edit your book, you'll face difficulties. There's no other way to say it. It's true.
You'll be asked to do what the veterans call "killing your darlings." Pieces of your work that you love will hit the floor instead of the printed page. And that is always hard. It's okay to name that truth.
In each decision, ask yourself, as your editor no doubt is also asking, "What's best for the book?" This question can ease the sting, even if it doesn't soothe it completely.
Do what's best, dear writer. The hard decisions take courage. We honor you for them.