hi, just did mine last weekend.. my mate works at holden and the procedure he gave me was to drain it, do the service, replace filter, gasket etc, then take out ur filler plug, which is located at the side of the box, on the passenger side at the back, its just above the top of the pan, looks exactly like the drain plug, but its a slightly diff size. the tricky part is filling it, u need to put the fluid in thru the plug until it starts to run out (just like a manual) but then u need to start the car, the torque converter will take up sum fluid, then with the car running u need to add more fluid till it starts to ruN out again, then replace the filler plug DO NOT TURN THE CAR OFF TILL THE PLUG IS BACK IN OR THE DRAINBACK FROM THE TORQUE CONVERTER WILL RUN BACK OUT. u will need a t40 torxbit to get the plugs out, and mine took just over 5 litres of fluid, hope that helps