I guess I'm confused over what exactly is getting trimmed...
I looked at the pictures on LB's gallery... maybe I'm missing it but it doesn't look like the cladding was cut at all.

Do you actually cut the cladding or just the fender liner?
Do you need to cut any of the metal bits under the fender liner or just bang on them for a while?
Do you trim/bang anything in the rear or is this only necessary for turning clearance?