you need a short 16mm - 3/8" drive socket, a flat screwdriver and a hammer
the socket just fits over the nut, remove the nut, then remove the bracket from the subframe (by turning it), then using a screwdriver and hammer seperate the bracket, the bolt will also require removing from the bracket by refitting the nut and tapping gently with the hammer
use some silicone oil on the inside of the new bush and refit in the reverse order, you will find the bolt will need to be held whilst tightening the nut, but the bolt will eventually grip back into the bracket
there might be a better 'how2' on vvoc dunno..