For the cost of parts from FCP Euro ( which have lifetime guarantee on everything they sell even oils! Although sending oil back to usa isnt allowed...) it is worth doing for peace of mind. Its not hard to do the work yourself if you have a bit of spanner knowledge.
Most here buy from usa or uk for parts as post costs are high but parts are much cheaper.
Locally Sandwood Trading are brilliant.
https://www.fcpeuro.com/products/volvo-timing-belt-and-water-pump-kit-tbkit331wpgs
There is a cheaper kit if you look at their site too.