Citroen ZX1.4i Head Gasket

The engine of my Citroen ZX1.4i (Reflex) is leaking oil. Also there is oil in the coolant. A Citroen specialist told me that it is the head gasket. I am thinking about it to replace the
gasket by myself. I have a technical manual, that describes how to do it, it doesn't look very difficult.
Has anyone some tips, comments or remarks to make this job successful?
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