Yeah, throw the letter opener they give you away and use one of those box cutters.
Give yourself lots of time and you'll do a better job. There's tons of openings on the front bumper, just wrap over them and cut out the openings, leaving enough to overlap the edges. It's not easy covering a rounded, angled object with straight, square wrapping. It'll look like hell when your done cause of the wrinkles and bubbles. But you'll be an expert by the time you get ready for the trip home. (and you won't care what it looks like)