And the Manic Mechanic produced some excellent exploded diagrams.
I know you need the chain on in order to unscrew the right side nut, otherwise you have to twist against another socket holding on the left side sprocket nut.. which IME is slightly less resistant so it loosens the left side nut instead of the one on the clutch.
But then it seems it is more common for that (sprocket) woodruff key to break, so maybe check that one before proceeding with disassembling the clutch anyway.