If it is in any way similar to a Jtd engine it's not a job for the faint-hearted. Many garages insist on removing the engine sending the cost towards £1000, however that's not needed. If you search this forum for clutch replacement you'll find the thread on diesel - it might be a very similar job on the petrol engine. A word of advice though - replace the dual-mass flywheel at the same time, or better still convert to single mass, far cheaper in the long run.
Good luck
