Ordered the replacement cable/plates for both sides (only one had failed so far).
Removed the toe plate.
Hooked the two cables in place and hooked one spring between the plates with the cables slack (bypassing the idler pulleys).
Then guided the cables over the pulleys.
Then hooked the second spring between the plates.
Replaced the toe plate.
Greatest difficulty was regaining my feet, as I am recovering from a broken arm, and don't have full range of motion.
My wife was present to hand me tools and to help me up.