they are simple, its like 9 bolts on the head and their are a few under the car for brackets and the collector. if you have a jack and can put your front end up it shouldnt take long...i wasnt able to get the oxygen sensor out of my stock manifold but supposedly you can. once the old ones are off gently clean the mating surfaces of the header and the head (no debris insdie head) get a new exhaust gasket and bolt them up (primaries first if they are 2 piece) finger tight and then torque from the middle out staggering up and down and alternatingside to side, only turn like 1/4 turn past tight....breaking studs is b***h ass, but if nothing goes wrong maybe 2 hours at most, less than an hour if your good. dont pay anyone, its too easy a job have a friend help.