How do I disconnect the parking brake cable while changing rear pads

After changing the front rotors and pads, I need to change the rear rotors and pads on my 2002 Elantra and I am stuck with how to proceed.

If I remove the parking brake cable adjusting nut close to the handbrake will I have enough slack to rotate the pistons back with a universal caliper reset tool, or do I also have to disconnect the cables at each caliper.

The hyundai service manual says to disconnect the parking brake cable mounting clip but it doesn't identify the part. There is a small U shaped sheet metal clip about 1 inch long that holds the exterior of the cable near the caliper, and also a larger thick steel cable support bracket about 3 inches long that is bolted to the caliper assembly. Which one is it?

If the bracket holding the barrel end of the parking brake cable rotates when the pistons are rotated back I can understand why both parking brake cables have to be disconnected, but I don't know that it does, and I don't want to remove more parts than are necessary.