Doing mine this weekend. There are three parts, the front that leads to the pedal, the intermediate that controls the left drum and connects the right drum cable, then the right drum cable. My right drum cable was beyond stuck, I could not pull the cable for anything. That was the cause of my drag though any of those three could cause it.
It's no harder than doing the brakes, but it is easier if you have them apart alreadt as I did. It is tedious though, and a pain fighting to get enough slack to do it.