A Dremmel rotary tool is what you need. You'll also need some cutting discs to go with it. I don't find it too hard to use, although I haven't tried to do anything for aesthetic value alone (more interested in cooling, personally), so it might be much harder to get the precision you'll need.
As for having someone else do it, I know there's at least one place near me that does professional computer mods. Try looking around where you live to see if there's a place like that.