My editor, Destiny Writers, was a joy to work with and I highly recommend them!
When looking for an editor, I recommend joining social media writing groups who can make recommendations. It is important to hire an editor who will be in touch with your topic.
For instance, it was important for my editor to be familiar with the Bible. Along with editing, I was hoping for an editor who would be sure my writing did not conflict with Scripture.
Have at least one chapter ready that you can send as a sample to those you might hire. I chose a chapter that provided an overview of my entire book. Do not be disappointed if it takes a while to find someone who is a good fit. I was rejected a few times before finding Destiny Writers.
When I began working with my editor, my manuscript was far from finished. Our relationship began with coaching and moved into editing as I completed portions of my book.