Removal of 2008 Prius steering wheel -

with a small flat screwdriver, remove the 2 by 2 inch black plastic covers behind the steering wheel. one of them has a hole for the cruis control lever.
loosen but dont remove the two torx screws behind these covers.
allow the airbag to fall out into your hands.
carefully raise the two yellow retainers on the airbag wires, then pull the wires away from the airbag module.
then squeeze and pull the black horn wire from the airbag.
to replace the steering wheel, unplug all the wires you see and remove the 19mm nut holding the wheel.
then by hand wiggle the steering wheel toward you.