If the head gasket has blown on the car and you don't know what you're doing, i'd recommend getting help. The top half of the engine (the head) needs to be removed and refitting if you don't know what you're doing can cause more problems than you already have. problems such as reconnecting the wiring in the correct order, setting the timing, the smallest error can result in bent valves, electrical & ECU problems, the car never working again without a huge bill and quite possibly fire risk from spilt fuel. It's better to turn to someone for help.
Moz, January 2007