Getting the front brace on was a bit of a pain for me due to the wiring harness, hoses, etc. that can be in the way up front. The tunnel brace wasn't really an issue.
To get the exhaust off of the hangers, I sprayed a bunch of silicone lubricant - it's inert and, unlike WD40, doesn't make my hands, tools or clothes smell -on the hangers and wiggled them around a bit to get it into the inside of the rubber hanger holes. After that, with a little leverage, they popped right off and went back on very easily. (I use the same stuff when installing things like intercooler couplers. It's quick, easy and makes the whole experience much more pleasant.) Jacking up the muffler a bit (with a block of wood on top of the jack) can relieve some of the tension on the rubber hangers which also helps.
The rear brace was a bit of a pain just because of the drilling. But, it still only took about 30 minutes if I recall correctly.
Blue-ish 2006 2.4, Werks stage 1 turbo, Borla cat-back, DDM braces, Spec aluminum flywheel, Spec stage 2 clutch, Werks aluminum radiator, some gauges, RKSport hood, Morimoto FX-Rs, GReddy Profec, Norm's fenders
'07 GXP, Werks Big Wheel K04 and tune, Solo catless downpipe, TCE Wilwood 6 piston front brakes, 4-piston rears , stainless brake lines, slotted/drilled rotors, BC Racing BR coilovers, Performance Autowerks intercooler, DDMWorks CAI, charge pipes and braces, RPM rollbar