Many writers like myself don't have an editor. Unless you have money to spend on editing services, or someone owes you a big favor like that stranger you rescued from drowning 10 years ago (and it's a long shot he or she reads your genre anyway , she might be into Beowolf) you might not have an editor. What to do? I like to set my story aside for a while. It really helps to clear my mind of it. Like I have been doing for the last few days over Christmas. The story has been completed, yet I know it is not finished.
I think of my story as a painting. The rough outlines, filling in shapes, unifying many different parts into the whole. There is something to look at here, something amusing perhaps, for the reader to linger over...and a jolt there making the heart turn over.
Then, there's the polishing - that which makes it beautiful, a stand-out, I hope.
When I go back to my story I know I'll see things that I couldn't see when I was immersed in it only a short week ago. A character needs sharpening. A bit more color in this scene. And did this character say she doesn't drink tea in Chapter Two and here she is telling someone she takes a spoon of sugar in Chapter 26?
Maybe draw out this dialogue a bit, you want the reader to remember it. And shorten this other...nobody cares what this minor character has to say if it doesn't move the story along. The spelling errors, the repeated words - the stray words left after I copied and pasted a bit from one section to the other.
My favorite part of writing is to get my fine sable brush and do a little highlighting here and there...so to that now!