when u drop the beam, the 'usual' first thing that happens is that the captive nuts in the chassis section that hold the big dohnuts snap and turn so you cant gent eh 2 long bolts out. u usually have to cut away the slot as its too thin to geta spanner into . when u refit them ,weld a bar across the flats of the new nuts and whack plenty of copper slip around them. you will have to weld the section back up that you cut out aswell to give it its full strength back - IIRC, you have to use bolts though from the otherway, ie, pointing down instead of up as from factory.

the trailing arm bushes (one the beam is off) can either be pressed out (again IIRC mine took about 30 tonnes of pressure on a hydrulic prss to shift them, the otherway is to get the end of the arm hot with the 'blue saw' and use a void bush puller, i don tlike this way as much as it may weaken the metal with the heat, but you can get away with not having to disconnect all the cables and half shafts.