The 3M stuff isn't very hard at all; you just need to be patient. I bought a roll of 12" wide by 6 feet long for $70 online, and it was more than enough to do the front of the hood plus other odds and ends (the sill plates in the front, for example).
I did a walkthrough over on a "competing" site that shows how to install it; I'll probably post it up here eventually too. Remove the spaces from the URL (the forums here filter out "competing" site URLs):