Some very basic things that apply to most any head gasket replacement:
Disconnect the negative battery terminal.
Drain the coolant system.
Disconnect all of the wiring, connectors, vacuum hoses and so forth that are going to prevent the head removal.
Disconnect the header pipe(s)
Access and remove the head bolts.
Remove the head.
Thoroughly check and clean both the block and head mating surfaces - if you can't visually see any problem with the head gasket, take it to a machine shop and have the head checked out for flatness and any possible cracks. (Blown head gaskets are always easy to detect when the head is removed.)
Check the gasket against the old one to assure it's correct and install it on the block being sure to note any "up" or "front" markings.
Carefully torque the bolts in the recommended sequence (very important step).
I generally change the oil and filter during this repair because coolant will inevitably get into the crankcase.
Put 'er all back together, top off and bleed the coolant and you're good to go on a road test - bring it back and check the coolant level, any leakage or tools under the hood.
