Most writers know that it can be incredibly difficult to edit your own work. That's because of the wonderful (??) propensity our minds have to seek the familiar, and to fill in blanks with what we expect to be there. That's why we will often read, “The boy ran fast” even if what we have actually written is, “The boy ran fats.” We expect a boy to run fast, not fat, so our mind “helpfully” corrects it for us, just like that annoying auto-correct function on a smart phone.
The good news is, that ability of our mind can be harnessed to work in our favour. Recently, I ran the first Short Fiction Award through my imprint, Birdcatcher Books. Along with several other people, I spent a couple of months judging the entries. Stories were marked on a number of criteria, including plot, characterisation, settings, grammar, style and reader appeal. I found myself reading in a whole new way, and when I next looked at my own work, that new way carried over.
It's like red cars. In the normal course of life, you probably hardly even notice red cars. But if you buy a red car, suddenly they are everywhere. Again, it is your mind seeking out the familiar. When problems in the various areas of the stories I was judging became familiar, suddenly they stood out like red lights when I found them in my own writing.
Obviously, not everyone has the opportunity to judge a writing competition (if it is ever offered to you, grab it with both hands), but you can bring the same forces to work in your own writing by pretending to be a judge. Choose a piece in the genre in which you normally write, and analyse it using the criteria above. Does the plot develop satisfactorily? Is there movement? Is there crisis? Does the ending work? Are the characters believable? Is the POV consistent? Is the dialogue appropriate to the characters? Do the settings draw you into the story? Are there any grammar or spelling errors, or typos? Does the style draw you in? If you were marking this story on each of the criteria, what would you give it out of 100?
Do this a few times, and when you return to reviewing your own work you will find that your mind's search for familiarity will kick in, and you will become aware of, and therefore able to correct, failures in any of these areas.