Within my various writing groups (mainly online), it's not surprising that I encounter a variety of interactions about finding an editor. While some know that I'm an editor too and not just a writer, when I take part in these conversations, it is only to pass on my knowledge and experience about the things that writers should ask when seeking to hire a freelance editor.
The questions below are general. You might not need to ask every question, but getting the answers before you work with an editor will help to go a long way in forging a healthy working relationship with your editor.
In fact, these questions can apply to any freelancer that you might hire to be part of your team, be they a cover designer, book formatter, publicist, and, to a lesser extent, an agent. (Yes, an agent is technically a freelancer too.)
Within this post, when possible, I have also included my answers (as the editor).