How to replace combination switch on ml320
 

I accidentally broke the handle of windshield wiper switch on my ml 320. I went to the local dealer and they told me I have to replace the whole combination switch t/s & w/w. It costs $260 for part and plus the labor. I found that part only costs $190 on the internet. So if I can do it byself, I would be able to save alot $$$. Please help me! thank you

Buy the service DVD ... which by the way will cost more than $70, which is NOT a lot of money in the context of Mercedes.