Easy.

The hardest part will be removing the grips. If you have an air compressor I recommend getting an air gun nozzle under the inside edge of the grip and blowing it off. Otherwise it can be pretty difficult.


Once you have the grips off, remove the brake levers and shifters. Put the new shifters on, and put everything back together. After the grips, the next hardest thing is the cable and you already know how to do that.