A good editor is invaluable when starting out. Later on it perhaps depends on how complex the story or writing is. Editors can be looking for similarity not originality. The final script a poor representation of the original story or article. An article of mine, which was picked up by Wikipedia for its originality and informative ideas was given forty edits from around the world! It was like a mechanical invention rather than an interesting article in the end!
After doing your homework to find the perfect editor, you might discover that the person with the most experience and rave reviews also charges the most for their services. If you don’t have piles of cash to pay a top-ranked editor for your first book, consider giving a newbie a chance. You can find affordable editors on the Freelance Writer’s Den job board, social media groups for self-publishers, and online platforms like Upwork, or Reedsy.
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.