It wasn't really a big job at all Ali, I used a breaker bar wedged against the wishbone, removed the electrical conectors from the injectors, and turned the engine for a couple of seconds to loosen the bolt. Then I cleaned all the melted rubber from the side of the engine, which had been deposited as the pulley was coming apart! Put on the new pulley and bolt hand tight and fitted the air-con drive belt, before tightening the bolt up, and fitting the serpentine belt. I knew mine was goosed because it had a hell of a metallic rattle on idle too, and I could see the rubber wasn't holding the inner and outer metal parts separate as it should have. The wife said it sounded like a sherman tank
Runs very quietly on idle now though