Hopefully this helps and im not telling you something you already know. Back off your bleeders on the wheel cylinders first to release brake line pressure. The ten nuts in the middle are for your axle shafts. With the nuts off give the centre of the axle shaft a tap to release either collets or the gasket seal, axle should slide out revealing the drum bearing retaing nut. Undo the nut and remove the bearing now your drum should come off. If not a bit of brute force may be in order. Sound like youve got a bit of a project on your hands!