Hi Paul_c,
You beat me to it, yes take the engine off and leave the clutch assembly attached as it will all simply slide straight off the transfer shaft. I would clean the wearing areas of the shaft with a long strip of emery so as to polish the shaft and reduce any excessive wear of the associated parts, eg. the internals of the new thrust pad you will be installing as all these parts are no longer cheap and preservation is the name of the game.
Cheers,
BB