Even an advanced writer recognises that full responsibility for editing one’s own work is dangerous. Some errors are simply invisible to the author.
Still, an advanced writer should have a sufficient grasp of technique to do a pretty solid edit – good enough that a publisher or agent will see the quality and potentially offer an additional editorial scan.
The edit is an opportunity to cut extraneous matter, refine description, sharpen character and polish the narrative. It might mean rewriting a sentence or simply choosing better word. Here are some before-and-after snapshots showing how small changes can make a big difference.
Original
With the blinds down and the subdued lighting, David thought: looks like someone has already died. He looked down at his father’s yellowish skin and hollow eyes – just a shell of the brawny, virile man he’d been not long ago.
Edit
The curtains were drawn and the lighting subdued – like