To be honest i knew nothing about installing car audio at all. I ordered from crutchfield and the wiring adapter made thigns a breeze. honestly most of the major install is easy with a few tricky parts like the VSS and things like that, but you can get perfectly good feedback from thsi site. I've installed the HU, rearview camers, and gps myself and saved myself alot of money. ALSO SO NOT BELIEVE THE COST PLACES LIKE CIRCUIT CITY QUOTE YOU. they dont include things like "labor" costs. they may say installation costs 250, but then there will be shop fees, mounting harness fees, and a dash kit