Domino Overheating Problems


My '89 Domino has just blown its head gasket & after a few minutes running, water forces its way from under the pressure cap & spews out of the header tank. I take it therefore that it's being pressured by the cylinders somehow.
My main question is, where can I find a manual or instructions about undertaking this job on a Domino or could someone just give me a list of the key points. I have done this before on a Sunny & a Renault R8! so I might be able to remember the basics.