Face facts, without a group of beta readers, your editing is incomplete. You can only do a certain amount of self-editing, at least 2 or 3 passes over your writing before you need the aid of some fresh eyes.
The best would be fellow authors working as a small support group, or a local writer’s guild that has a critique group. You can even try to create an on-line network of fellow #indieauthors.
Here’s what I’ve discovered about beta readers. They can point out things that just passed over your head. Those types of errors are easy for a writer to make because everything is clear to the writer, and sometimes it’s hard to put yourself into the mind of a person who knows nothing about your plot and characters.
When I presented the #shortstory Little Red Revolution to my critique circle, I thought that my main character’s attitude was clear. However, the readers understood and perceived his anger and displeasure, but then questioned why his attitude changed so rapidly. I never intended for anyone to see a change until the final paragraph of part I, but all of the readers thought that the change occurred four pages earlier. Why? Because I had failed to clearly explain that the character also expresses his anger through sarcasm.
The readers thought he had become comical too quickly, a change that I did not intend. I’ve altered it based on their feedback. A good beta read can give your work a final polish and quality that the general reading public expects from a traditional publishing house.
Have your beta readers given you some insightful commentary?