if it needs doing, get it done asap is the main poin to stress....i belive its 35k or 5 years which ever comes first?
i decided not to attempt it my self, mainly because there was too much risk in me messing it up, and i know a good garage, with warrantied work. also the cam lockign tools can be quite pricey last time i looked....i think i paid £350 for timing belt, tentioners, pumps, variator and aux belt....