CD Changer installation for S420

Hi Mercede Fans,is I have a 1996 S420 Mercede Benz, would like to install a JVC KS-RF37/KS-RF35 cd changer controller and CH-X200/X11 CD changer. What other componment do
I need to buy in order for this to work properly? How difficult is the installation, can an average Joe do it?
Thanks in advance, Dara

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