The new speaker, 39120-STK-A12:
Remove the top speaker screw and place it in a labeled baggie:
Gently pry the top of the speaker away from the door. Do not go much farther than depicted, or the lower speaker tabs may break. Then lift the speaker up and remove the lower tabs from their slots. The speaker is still attached by the speaker wire.
Squeeze the plastic tabs on both sides of the wire plug to disconnect it, and place the speaker aside:
Here you can see the slots for the speaker lower tabs and the upper screw nutplate:
This is testing the new speaker for Honda required nominal resistance of 2 ohms DC. (Speakers are classified 2 ohms, 4 ohms, 6 ohms, etc.) Testing a speaker for DC resistance is not that useful, as it is only a general measure of the actual impedance; and the old, failed speaker tested at 2.1 ohms as well.
Plug the wire connector into the new speaker. Carefully slide the speaker into the lower slots and insert the top screw.
Check the nylon fasteners on the door trim panel for servicability. Note how the trim panel hooks over the top of the door frame.
While holding the door trim panel close to the door, plug in the window/lock electrical connector and snap the inner latch back into the 4 spring clips.
Hook the upper trim panel into the slot in the top of the door. Make sure it is seated properly, and the nylon fasteners should line up with their holes. Work down the sides and bottom of the panel bumping the nylon fasteners into place.
Install the upper and lower door pull screws. Use caution, the metal screws are driving into plastic nutplates -- don't overtighten. Check the door pull handle for security and snug down as needed. Snap in the plastic screw covers.
Connect the tweeter wire plug and insert the wire protector into it's slot on the bottom of the tweeter housing (look at the tweeter pic for reference). Snap the tweeter into place.
You are done. Crank up the Barry Manilow!