Well. We survived installing a door..barely. Our house is 100+ years old and to say it isn't very square/plumb would be an understatement. In order to get the new door to fit, we ended up chiseling and planing out some of the existing door frame. Even then, the hinged corner is slightly off kilter. We are getting ready to install a second door, and are wondering if it would be easier to buy the door with the frame rather than just the door. From our experience, it wasn't that difficult pulling out the existing casing. BUT, even with a new casing, it's doubtful that the frame will be square. Any help, any insight will be greatly appreciated. Do know that we realized our kitchen is beyond our capabilities. We pulled the l960's drop ceiling down to discover at least 3 different ceilings underneath...ranging from horsehair plaster to splintered tongue and groove to cardboard squares. It's amazing what people did.... Thanks again for any direction provided.