Fat mat is a tar like mat that is sticky on one side and has foil on the other - you peel and stick basically.
Bolt you will snap will be the inner fender and lower fender bolts - my advice - take your time, heat them and turn them out - but watch for fire
Also, don't buy any toyota fender clips and quick nuts - I have a bunch her e- and they cost me about 5-7 bucks each! Fricking crazy.
I POR15'd the inside of the fenders and most of the rest of the front clip - should be good for a while.