This is an in-depth project. It will require evacuation of the refrigerant from the A/C system as well as removal of the dash.
See the attached guide below on heater core replacement, it is not vehicle specific, but will give you some idea of what is involved.
Below are the diagrams from them manual on removing your heater core, check them out and let us know if you need anything else.
Images (Click to enlarge)
Saturday, November 7th, 2015 AT 7:58 PM