First, huge thanks to the OP for this helpful and detailed explanation. The pics really helped, and I was able to do this in about 30 min.
Push on the gas pedal to find out which one is the actual throttle cable. The one that moves is the one you DONT want. Reach way up ontop of the pedal assembly, and push/pull the cable up and out of the assembly.
Pretty sure this part is written incorrectly. When you push the gas pedal, the cable that moves is actually the throttle cable, and you DO want to keep that cable entact (i.e. if you cut it, you're SOL for pressing the gas lol).
The cable that DOESN'T move when you press the gas is the one you want to remove. It's pulled in the opposite direction by the cruise control assembly, which manually depresses the gas pedal. That's the one you want to remove and pull back through the firewall.
Just figured that was worth clarifying for anyone who comes along like I did and scratches their head for a moment at that part of the instructions.