Continuing this post series with a tip for editing and working with editors:
You should never blindly accept/reject changes made by your editor.
Your editor went through great lengths to read your book and make suggestions. The least you can do is return the favor by reading through those suggestions word by word and considering them before you accept/reject, if for no other reason than to see if the tone of your book has been preserved, and if the suggested changes make sense for what you’re trying to accomplish. You owe this both to yourself and your editor.
Additionally, if you’re self-publishing, the last eyes to read through your manuscript should be yours. Even if you are with a publishing house, you should read through your final edit word by word before you send it back to your publisher. People make mistakes, even editors and proof readers. Errors get overlooked, changes don’t always make sense, sometimes you find you liked it better the original way. Sometimes you discover a plot hole you didn’t see before. Always do at least one final read-through of your book before you start formatting and publishing. It’s worth the final, tedious hours of picking nits to spare your readers a frustrating experience and avoid bad reviews due to poor editing.
Bonus Tip: Changing the format/font/size of what you’re reading helps you spot issues more easily. Put the book on your eReader, or print it in different dimensions to disrupt the pattern of shapes your eyes and brain are used to seeing. It will force your brain to focus on what is actually there, versus what it expects to be there.