Not much but it helps to have the right tools!
I use a "piston stop" tool that screws into the glow plug hole to lock the crank in place it cost about $8-$10 at your LHS. Remove the C-clip or screw that holds the clutch bell on, remove the clutch shoes and spring or springs and then loosen the clutch nut to take off the flywheel and reverse the steps to put it back on but, check to make sure that the shoes and spring or springs are still good!