is it a hard job or easy???
very easy job if you have the correct tools.
you'll need a puller to get it off as it's a press fit, a rattlegun would also be handy to get the bolt off and back on more easy, otherwise there's other ways of getting it undone and redone up, it has to be tightened to about 300nm from memory.
Also you have to make sure you buy a ballancer that's the same model as yours, series 1 is different to series 2