I'll try to do this quick and easy.
Drain cooling system
Disconnect heater hoses
Remove lower trim plate
remove gain control connector
remove cluster trim plate screws
remove plug on cig lighter
remove screws holding light switch rod
remove cluster trim plate after releasing light switch rod
disconnect aspirator tube and electrical from sensor
disconnect inside temp sensor
Disconnect PCM from attaching bracket, let PCM hang, leave wires attached
Disconnect vac and side electrical connector from programer
Disconnect temp valve link rod, reach up threw PCM brackets to gain access
Remove programmer screws
Disconnect temp valve actuator connector. reach up threw PCM brackets to gain access
Remove retaining screws and heater core cover
Remove heater core from car.
Reverse order to install.
Hope I got that right.