on Just Publishing Advice:
When you sit down to edit a book, you want to improve your story and your writing.
It’s a good idea to do a thorough grammar and spell check before you start. You have a choice of plenty of premium and free grammar checkers to help you.
But a grammar check is not editing. The editing process starts when you carefully read your manuscript, line by line.
If you don’t have a professional editor, you can learn how to self-edit your book by following my checklist of 20 common faults.
Chris The Story Reading Ape's Blog 
Thanks so very much to Derek for this very useful set of tips -and wise words – to writers who plan to edit their own manuscripts.
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