Try finding a few beta readers and use the SYW forum before spending bucks on an editor.
You'll find books on self-editing in the library's 808 section. For free!
I found with my first MS that just because I stuck "The End" on the last page after so much hard work that it wasn't at all ready for the market. Had I hired an editor to work on that draft it would have been like asking painters to come in and do a house before the drywall was in place on the bare frame!
If it's rooting out typos and fixing grammar, then that's stuff you really need to learn for yourself. There's a NYT bestselling writer I've edited, and I can't stand her books because she was asleep all through 5th grade English. It's physically painful to me to see such sloppiness in a MS, when it's so easily fixed.
One of my pals is dyslexic, but always turns in a clean page, thanks to spell-check and a friend who proofs the work. I like that she takes pride in her job and doesn't make excuses!
If it's evaluative feedback you need, then it's betas & SYW time!
I still send my stuff to a trusted friend for a read- through so she can tell me what needs fixing. Nothing like a second set of eyes for spotting obvious clinkers. In turn, I read her stuff. We keep each other sharp!
Good luck!