its easy enough to change if your competant and have the timing tools,
theres 2 timing belts on these engines, be advisable to change them bothwhile they're off,
they were bad for the idlers breaking up as well so full timing belt kit is your best bet,
as the water pump runs off the cam belt they need to come off anyhow,
if your competant enough you shaould be able to do it on a sat afternoon no probs