the harness just go into the back of teh ignition and the fact. wire goes into that. its quite simple to do urself. but the hiding of wires and such.. gets ur nerves going.
i dont know, i just go straight to the place.. nice guys.. and honest prices. but book in first if u want it done. takes around 4hrs for the whole system. mayb even 2-3 if all the guys working on it.