Writing a book can be a really stressful thing. Speaking for myself of course, I hate editing, and we all know that editing is the final touches that can make any manuscript great, passable, or crappy. There's just too much editing to be done for me to do it in one sitting.
First there's the spell check and simple grammar editing that needs to be done, but thanks to computers, that process has been made easier...or not. I don't know about you, but I have found that grammatically incorrect sentences can be what makes a book believable. Nobody speaks with perfect grammar. So, it's impossible to write an entire book with a dialog, and not have some grammatical errors in them. So, now when you're spell checking, you have to remember to ignore all of these different mistakes, which aren't really mistakes at all, their deliberate.
Second there's getting the manuscript off of the computer and on to paper. At this point I usually read whatever it is I am about to print several times over before I actually print it, so that there will be fewer, or possibly no errors after it's printed. (That has yet to happen to me however.) After I have the work on paper, I either read all of it or portions of it, aloud to either myself or to somebody else. No matter what method I use, there is usually a truck load of mistakes found, whether they are; spelling, grammar, or plot mistakes, they are there and they need to be fixed. Once the printed manuscript has been thoroughly butchered to almost beyond recognition, I go back onto my computer and make the changes that are necessary.
The third step is almost exactly like the second. I may have to print out my work three or four times before I believe that the work is as perfect as it can possibly be.
In the end, I am satisfied that I have done all that I can to make my work perfect, I have spent more time editing than I did creating the main idea for the story, building up the story, and writing the darn thing down.
I don't have an ending for this, so.....