There are two covers. The larger cover, which you pull down perpendicular to the windshield, and the smaller cover that butts up to the headliner. Technically you should remove the smaller one first (by pulling away from the larger cover and towards the headliner), but it's not necessary. Just be gentle as the locking features are all plastic. It's frustrating the first time, but after that you're a pro. Sit in the passenger seat as I found it to be much easier.Do you have to remove the cover on the base of mirror in order to access these wires?