How do you self-edit your novel?
I cheat. Belonging to a writer's group is great. Six sets of eyes are better than one, and they find the bulk of my errors. There is a gentleman who is a grammar ace. He finds every misspelling, every word that should/should not be hyphenated, should be two words, or italicized. I also give it to my friend who is an accomplished proof reader. We read each other's work.
Of course, there is always spell check, but it doesn't find everything. Believe me, it doesn't, and it isn't always up on the latest information.
Here are a few tricks. After you've read your masterpiece on your computer, print the WHOLE BLOODY THING out (we recyle all paper, so I don't feel that guilty) and read it on the written page. Move it to your Kindle or electronic reading device. Somehow, a new device makes the errors pop out. Maybe a couple of friends with sharp eyes can be arm-twisted into reading the finished (well, almost) work. Give them pat on the back in the credits and a free copy.
By now, you should have a clean manuscript. If your publisher doesn't offer editing (most do) or if you're self-publishing, you can hire a line (not a developmental) editor for the final pass. This can cost a lot.
I believe submitting to KDP also involves a spell and formatting check. If you self-publish, there is usually a mechanism for making corrections down the line. With a steely determination to find every typo, you should not have to do this very often. And remember, even the New York Times makes an occasional typo. If your readers point it out, fix if you can, otherwise, well, it happens.
I found six or seven typos going through the above words a third time. No doubt you can find some more.
Here are some accomplished writers with good advice.
Skye Taylor http://www.skye-writer.com/blo
Diane Bator http://dbator.blogspot.ca/
Beverley Bateman http://beverleybateman.blogspo
Connie Vines http://mizging.blogspot.com/
Anne Stenhouse http://annestenhousenovelist.w
A.J. Maguire http://ajmaguire.wordpress.com
Victoria Chatham http://www.victoriachatham.com
Helena Fairfax http://www.helenafairfax.com/b
Dr. Bob Rich https://wp.me/p3Xihq-1yE