by sub housing, im guessing you just mean the whole thing. If so.. yeah, pick up a haynes manual while you are @ autozone getting the dist w/lifetime warranty i think. or i guess just 90 day.
but its pretty much just marking where it is. taking off wires, and then the 3 or 4 bolts that hold it on. and when you get the new one, it comes with a ignitor coil in it so dont get another one.