For the life of me, I can't detect any systematic pattern in what you are trying to do. If you can't state the particular systematic pattern change you want to accomplish, you will never be able to do the manipulation with those tools.
You might want to look at the kde application, krename. It's a very powerful graphical file renaming utility that can use, among other things, regular expressions, which is probably what you need. With krename, you can also preview how the changes will look before they are made so you can avoid doing something you don't want to do.