Self-publishing may be an inexpensive way to publish a book, but without thorough proofread and editing, it can turn out to be an embarrassing disaster.
While there is just no escaping the absolute necessity of having an independent pair of eyes at least proofread your book before publishing, you can save yourself a lot of money and embarrassment by doing some of the work yourself.
However, our brains are programmed in an odd way that can make it difficult to find errors in our own writing. So here are a few ways I have found that work effectively. This is not to say that you will achieve perfection, but I guarantee you will be very surprised by the number of errors you do find.