The reason I asked about your "where I live" statement is that in no way should you work on a property which you rent, that's up to the landlord to do that work, not the renter. Ownership is a different matter.
The wires in the boxes are all cut flush with the wall with the ends stripped and stabbed into the back of the receptacle. The stab connector can't be released because you can't get behind the receptacle because the leads are two short. So the leads have to be cut even shorter to remove the recept. And of course they are all the small metal boxes. No grounding pigtail and no ground wire to the receptacle.
Perhaps you can understand that just trying to do simple maintenance on this house becomes a reconstruction project.
If you have to change a receptacle, have you tried crushing the old one with a Channel Lock pliers?