remove all of the clutch bell and shoes like how chuckscity said, all you should have left it the flywheel on the engine, with some self grip pliers hold the flywheel still and try not to damage it. undo the nut with a deep socket, (8mm i think) then put the self grip pliers, as best you can, behind the flywheel(engine side) and gently but firmly tap them and the flywheel should come loose
actually if the flywheel is buggered, you can hammer the balls off it and not worry about damaging it!! lol
but hope this helps