When it comes to editing, there is one absolute–A writer should never edit his/her own work. Wherever else you may look to cut expenses in self-publishing, editing should not be one of them.
Most writers will do a spell check and possibly a grammar check on their manuscript. This helps to catch obvious errors and will help to get your manuscript ready for the editor. Do not confuse this with editing.
Writers may ask friends to edit their book. Or if they belong to a writer’s group, they may ask them to help edit. Again, it is a good idea to get your manuscript as finished as you can, but don’t confuse this as editing your book. Most of them will not take the time to read your manuscript thoroughly and those who do, usually will not know how to or won’t comment on poor sentence structure.
There are at least nine different types of editors, from collaborating with the author to a web editor. As part of our group of experts, we have editors who can help you gain that competitive edge over your competition that a well written, well presented book provides.
The final step should absolutely, positively, be getting your manuscript edited by a professional editor. In the interest of economics, you should never, ever hedge on editing.