You have to partially drain the radiator. Drain the A/C, remove the ac accumulator. Remove the entire dash, including all the plug-ins, and the steering column. Then the HVAC module that contains the a/c & heater cores, and blend doors, and duct work. It is very difficult even for an experience mechanic. I would rather remove a transmission, or even the engine than do one of these. Shops will usually charge you about $600-800.
Even if you buy a manual, or alldata.com it is pretty sketchy even with the step by step and the pictures.