if its the cylinders for the rear drums then i would say its easy if you like jigsaws :}
i watched the mechanic while he changed the ones in my old mk1 and it was very easy to change the actual cylinders themselves, 2 bolts and the brake pipe nut ( so long as the brake pipes are not rotted - thats the only bit that concerned him as he had been caught out with that one in the past and he said it was not a pretty bill for a simple job :} )
the only bit that looked a problem was putting the brake shoes back in correctly as it was a mass of springs & little bits of metal that hold everything together, but if you you could manage to do that then it should be a doddle, the only other thing needed to be done was the bleeding of the new cylinders and the job was done.