The technique for cutting the sheet metal is an old, tried-and-tested process in the Jeep XJ community. Just search youtube or any jeep forum and you'll see the same method each and every time. Trim the sheet metal up front, and "cut and fold" the sheet metal for the rear fenders. What I did was I tried to trim off just a enough so that there would still be a little tiny metal fender flare left. This meant cutting right along a bend in the sheet metal - which also meant the shape/profile of the fender arches would remain mostly stock - or, in the case of the rear, cutting up to that bend and folding the sheet metal over at that point. This also allowed me to keep the windshield wiper fluid reservoir hidden between the outer fender and the inner fender. After trimming the sheet metal, I cleaned them up with some truck bed liner paint, and the end result looks great and functions beautifully.