Jack gave you a link for detailed instuctions, it's really not a difficult operation, I did this a well as other mods just last week.
Understand the terminology, a service manual will help you here. Be sure to disconnect the battery, neg side, because you will be entering the switch housings and during reassembly there is a chance you may pinch wires and fry something, this happened to me. Go slow, don't get flustered, if you do, walk away and come back.
Once finished, bask in the knowledge you have done it yourself and learned about your ride. Cheers!