I did this at my mother-in-law's house. I used the same process Muddywings and rondog are describing.
Double check that there is nothing inside the wall that I don't want to cut then cut an opening of appropriate size.
Frame in the opening so the door is sitting on something solid.
Install the door.
Clear silicon caulk to seal the outside edge.
It took about an hour. Piece of cake.



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