Hey man! It's Andrew. I think I've talked to you on clubeg6, my name on there is SiR.

Anyway, we have a write up on the clubeg6, but to answer your question in short, just take your time and dremel away. Make sure you measure. On my spare bumper with fogs, a lot is cut out, but there are three spots that are there for screws. Obviously make sure you leave those there, because you'll be using those to screw them in. With the rest of the plastic just measure, cut and repeat. You can always cut more if it's too small, but its a lot harder to fix taking too much out.

Hope that helps.