I believe the old vauxhall engines are really easy (in comparison) to change the clutch as you just remove a plate from underneath the gearbox and it only takes an hour or so to do.
If you get alot of spare time, have an engine hoist, mechanic mates, a Haynes manual and some mechanical know how the i would suggest doing it yourself.
I once done my AX clutch, had the 2 front wheels of, car was on bricks, had the engine resting on a crappy car jack which was also on bricks and 2 of us trying to push the gear box back in place, all good fun. Took a full day to do between 2 of us and cost £30ish.
Second time we learnt our lesson and got an engine hoist to change one in an escort GTI.
For the sake of £30-£50 labour charges, it is well worth you taking it to the Garage though
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