I use a proper spark plug socket with a universal joint attached to the ratchet to give a bit more flexibility in movement.
I've just been outside trimming the ends of my HT leads funnily enough.
I know with earlier models, including mine, the tank has to come off to remove the air filter, but i'm not sure about your model, in the back of mind i remember reading you could avoid that with 02/03 models but i could be wrong so someone will no doubt give you a more solid answer very shortly.