Easy peasy to do. It is a 24mm socket to undo the nut on the wheel. Disconnected the battery and did the plugs and leads while I waited 30 mins. Looks like the previous owner was pretty bad at aiming the oil into the engine , as when I took the oily plug cover off, was in the galley where the plugs were as well. Was all clean oil as well, so not from the engine or rocker cover gasket as was on the underside of the cover too. Stopped the plugs seizing in the head anyway !!. Cleaned out and degreased the plug cover and all sorted. Definately worth doing, as possibly the same HT leads from new looking at them and how stiff they were.