According to the iColours installation page, MacBook Pro installation is medium difficulty. I wish MacBook installation wasn't extremely difficult, otherwise I would have ordered that rainbow one months ago.
I did my MacBook awhile ago. It wasn't too incredibly difficult, though I was rather nervous while doing it. They say that the MacBook is "Extremely Difficult," so a MBP should be cake compared to what I did. Like I said, it wasn't too difficult, just made me nervous. Let me see if I can find pictures.
I think so. Either that, or the directions that came with it, if there were any. I can't remember. Just go slow and you'll be fine. I even did mine before the warranty lapsed!