By best results, I mean, not damaging the tiny screws or any other fragile part of the camera.
I would like to be able to open it, and then close it again.
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I have done this a few times with other canons, not the 7D though, my question to you is are you comfortable with micro assembly, very fragile connectors, documenting your take down etc?
Typically they use small Philips and some specialized ones as well take a look here for a visual guide.
Their are other issues, such as needing a special pry tool you can fake it but it's tricky, adhesives, some of which requires heat and some must just be carefully pried loose, and the order that things should be removed in is not always obvious so takes lots of pictures and label screws.
If you speak chinese this might help lol, of course you can just watch and infer what they are doing (might be an english version but I didn't find one)
I would suggest taking it to a tech unless you are already very good at this kind of thing.
Found this : http://www.youtube.com/watch?v=UOb55J09wbU
Seems that unlike iPhones, not so many screwdrivers are needed !
And I think I'll ask the incoming questions here :
http://camera-repair.co.uk/ (I am not a sponsor !)
EDIT : Photos of the damn EOS 7 being torn down (as far as I needed to!)
That was NOT easy, and I had special tools to open the beast. Also, doing this leaves traces on the screws. It will be obvious the camera has been broken into. DO NOT DO IT ON YOUR OWN. BRING THE CAMERA TO AN AFFILIATED CANON REPAIR GUY.