Briefly you will have to remove the black plastic air duct from the MAF/AIR FILTER to the throttle body first- slides sideways-then unscrew the cover plate on the cam cover to reveal either the long spark plug ht leads (early models) or the 2 spark coils and ht leads (1 per 2 plugs) be extremely careful when moving any of the wiring as the insulation can get very brittle ( due to close proximity to engine heat) then its just a case of removing the plugs via a sparkplug socket and suitable long extension. when replacing check the gap is correct 0.8mm and don't overtighten them in the alloy head.