My only suggestion is to be very cautious with the pneumatic hammer on the fieldstone wall, less is almost more when it comes to old stone and masonry. I like to chisel out one stone, then take some measures and go around to the other side and take out the corresponding stone. then I pick away at the material in the middle of the wall. If you knock too many stones loose they never seem to go back properly.
Back to your original question about your floor, take your hammer or small sledge and tap the floor in the area that you want to remove; if you find a section that sounds hollow start there. There are often voids under concrete floors, caused by any number of things, and this should be the easiest place to get through first.
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