Editing is a hot topic of discussion among writers, and my personal
religion. To put it mildly, I believe in the power of editing. No book
is complete without it. But at the same time, editing your own work can
be a very difficult, very painful procedure. Think of it as a necessary
evil all writers must face.
When's the Work Over?
So, you've edited for all the technicalities. You've edited for the readers. When the heck are you done editing? There's no hard and fast rules when it comes to editing, because every writer operates differently, but a good rule of thumb for editing is that you're ready to stop when you read your work and can't find a single mistake. Maybe it'll take two reads, maybe it'll take twenty-two reads, but if you're still finding mistake then you still aren't done editing. It's a real drag to edit and edit (and then edit some more), meaning it's extremely tedious, but the end result is worth it. A well-edited book looks professional and makes a good impression.
Would you rather have your work remembered as a sloppy mess, or a neat and concise work that reads well?