How tuff is it to change the center air vent panel? I purchased a new one and had Carroll Shelby sign it. I also got the dvd manual and I'm having trouble locating the removal of this item and putting in the signed unit. Spent an hour looking and couldn't find where to do this. If anyone has done this I would appreciate either telling me where in the manual or how to do it. Looked everywhere though and didn't find it. I do have a printed manual coming but wanted to get this done and ship the other piece to Carroll for signature. GGBIW