First I cut out a template using regular paper (you can see the brown roll in the first picture) and used it to outline the shape on the FatMat with a marker, then I cut the FatMat. Also make sure the surfaces are completely clean.
It's simply a matter of getting creative with the shapes. Don't make them too large. You can always fill in with smaller patches if needed. The area behind radio was a little tricky to get to and to get all the wires out of the way and to make sure the fiberglass was clean. The round shapes of the rear wheel wells also took a little time but again, you have to get creative with slitting the material so it fits right.
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