While self-editing is often creativity-destroying when writing your first draft, wise writers would do well to work through the following suggestions before sending their manuscript to a professional editor or to their beta readers.
In addition to making you more aware of your grammatical blind spots, self-editing may save you money if your editor works on a per-hour basis. And though editors love to display their knowledge, they also like reading grammatically correct manuscripts.
When you show that you’re a capable and confident writer who makes few mistakes, you may just endear yourself to an editor, and having one already lined up means one less task on your publishing to-do list the next time around. Furthermore, your beta readers and advanced review copy (ARC) reviewers will be grateful for the care you took in creating a readable early draft.