I have taught college preparatory English, writing, and grammar, for the last 18 years. My experience as a teacher makes me uniquely qualified to edit works for fluidity of thought and content, accuracy of grammar, and clarity. As a teacher, I have become a master communicator. Paying attention to detail is a requirement in the English field and something I have mastered.
It’s always sensible to follow due diligence in submitting your first draft of your book to an editor by making as fool-proof a copy as possible for you because first, it is your own creation, and secondly, a horrid draft sent your editor can end up frustrating both you and him or her. Make your own corrections to the extent you can, so that will make the job of your editor that much lighter and the end result would be a lot more effective.