Writers, particularly those in the field of self publishing, can, by necessity, never get enough editing tips - which is very fortunate, as I can never get enough of writing about them! Here are a few more useful ideas that will assist in the editing process.
It should probably go without saying, but I will say it anyway - always use a spell and grammar checker on Word or whatever other word processing software you are writing with. It is a bad idea to be solely dependent on these automated spell checkers and you still need to cast your own appraising eye over the work after they have finished their task - but on the other hand, if you have a tool, it is foolish not to use it.
Another tip is to have someone else look over your work. Even if you give yourself a couple of days away from it and then examine it, you could still be too close to your work and end up missing some mistakes that might be glaringly obvious to someone with a little more perspective. This does not necessarily mean that you have to go out and hire yourself a professional editor or proofreader - a friend or relative may suffice.
One tip that many writers find useful when it comes to editing is to use a screen to cover the text that you are not checking, thus preventing distractions.
p.s. There are never enough ways to check your work in order to ensure it is in its best form when presented to the public.