when i did mine i never did anything to a car before (first car) and it took me like an hour and a half just because i wanted to make sure i was doing everything right. and like BlueMango i pulled the wheel well liner back. but now i can do it in no time easily.
when i did my fujita i pulled the bumper, if you take your time and use a small flathead screw driver the clips come out quickly and you can use them again, even if you loose all of them tho just head to the dealer and buy another bag of them, they are cheap.
I have installed plenty of CAI's. Never once have I removed a bumper. Everytime I just jack the car up, remove the wheel and liner, then install the cold air extension. I hate taking off bumpers because I always break or loose clips. Even when I don't I still feel like it doesn't fit as well as it did originally.