I used a jigsaw to rough cut and then went back with a utility knife and fine tuned. Then I hit the edges with some high grit sand paper to smooth them. Did that on the old 98. The 99, I had to fine tune what someone in the past had done. Just don't take to much off, you'll regret it later if you do.
at the cost of it looking soo cool!!!! im doing it. alittle more mud cant hurt much. besides my wheels are way beyond the stock fenders so i still get mud everywhere. it'll be cool i think. i plan on buying another full set for that reason to switch it up =]