Charade TD Headgasket help please

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I have a Charade CDXi Turbo Diesel 1993 and the headgasket has gone.
Can anyone tell me how difficult it is to change and any possible pitfalls to look out for.
I have seen a gasket set on ebay for £27.50 are they any good?

Any help would be appreciated.

Thanks in advance

Garry