What's up.
You'll have holes that's it. Shaving the side moldings on a teg is super easy. Fiberglass and bondo and boom you are done. My friend can shave'em in like 45 mins. It's pretty easy. If I ever buy a teg the first thing I'm doing is a JDM ITR front end and shaving the antenna/wing/side moldings. Soooooo easy!
Anyways go to home depot pick up some fiberglass mat/cloth/resin and some bondo and you are in busines..
sand down to the metal. I usually make a dent where holes are, and fiberglass it to make it strong. Sand a little, lay on the bondo. Sand till it's perfect, and go up in grit till it's smooth, and then paint.
Easy as pie.