Fixing the head gasket requires removal of the inlet/manifolds and eventually the head from the block. The head gasket sits between the head and cylinder block.
To repair, you will need a head gasket set, head bolts, timing belt and a manuel + tools.
It is quite a big job, would take forever to explain. Ring round local garages for a price as they will be able to do it easier and quicker. Except a bill of £150-350. Also if your doing it yourself, the head may need skimming if the head has been damaged when the gasket went.
J P Evans, March 2006