How do you remove wires from fire wall junction correctly?

Great. It is easy once you learn the trick. For others, push in on the wire on the cabin side while you slide a thin tool from the engine side to push down the tab. A thin screw driver can work, but the beveled tip makes it harder. The first time I used a thin hand saw from the 99 Cent Store that was the proper width and bent the tip down so it better worked against the tab. I later bought the proper tool (cheap) when I bought a bunch of "56 terminals". It works slightly better.

The photo in post #2 shows the trick to release the male terminals on the engine side connectors. Needle nose pliers work, but I found a better plier tool with grooves (sort of like hog-ring pliers).