The plastic cover is about 2mm thick. Two 10mm nuts and its off. Then undo the bolts holding the coils in place, one bolt each, 10mm socket.
If you can't figure the rest out you shouldn't be anywhere near a car.
If anyone has the pleasure of working on the new Commodore V6, you have to take the plenum cover off to remove the spark plugs !!!!!!!!!!!!!!!!! (partly 'cos it's coil on plug)