As part of repainting the house exterior, the door and frame would get repainted.
To remove the door and frame, it was easiest just to remove the pins from the hinges, move the door, and deal with the frame separately.
The door frame was held in-place by several long casing nails. I loosened each nail with my crowbar, then removed them with locking pliers. I had my reciprocating saw handy in case it turned out to be easier to just cut through a nail.
The original installers drove some extra nails through the exterior door casing, into the stud that frames the door (the jack stud).
Once I got the frame out, I got the pleasant surprise of more wood rot! The subfloor and part of the footer had corroded. I dug out any easy-to-remove rot, then used my circular saw to cleanly remove the subfloor plywood.
I also had to remove a soaked piece of siding (old masonite), then replaced it with a primed/painted Hardiplank.
After removing the subfloor, the beams are exposed, so I placed down a new piece of plywood to serve as the subfloor for this section.
The new door waited ever-so-patiently for installation.
The rough opening was tight, but not too tight, so I went ahead with installing.
The included instructions specified certain locations to place shims to keep the door in-place before screwing the door frame to the jack studs.
After the door was minimally anchored, I added additional shims at the specified places and made sure the door swung freely and had an even gap from the frame. At this point, it was 11:30, so I quickly added the deadbolt and fell asleep.
The next morning, I double-checked alignments, anchored the door frame completely, then installed new casing.
A nice bead of caulk filled in the gaps between the casing pieces at the corners.
I added a new threshold piece to the laminate, sealed with black caulk (to match the door base.)
Here's the new door, functional but unpainted.
The door was painted in a white semi-gloss interior paint on the inside and Sherwin Williams gloss exterior white Emerald paint on the outside.