I had to do this a few months ago, when I damaged my switch doing a new stereo install. It's really not difficult at all. First, you remove the plastic steering column shroud, which, if memory serves me, is 4 screws. Your wiper switch should now be exposed. Then, you remove the wiper switch wiring harness, followed by one screw near the top of the switch assembly. Hear is a graphic:
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Good luck!