Installing with friends is fun, however,
Projects involving beer, food, and too much sun can leave you with scratched paint, lost tools, busted knuckles, broken bolts, friends pissing in your yard, and worst of all, a leaky exhaust.
I do most things myself but $200 for an install sounds like a freakin deal if you trust your mechanic. Unless your friends are waaaay more responsible than mine.

Save the beer, burgers, BBQ for helping out on someone else's ride.