I was not completely truthful in the last post. I use editors, sort of. When the time is right (gut feeling), I give the manuscript to my wife.
She will point out areas that still feel sketchy, logical inconsistencies, beats I might have missed or that can be reinforced with a little nudge here or there.
After manuscript updates, I pass it by my daughters for similar feedback.
Between all of us, I feel we have enough reading experience and command of the English language that the resulting manuscript is tight. Then I have a couple of months to polish it while my illustrator works his magic.