Hi. I am looking to install a new head unit and subwoofer in my Fusion. However, I am not sure as to how to remove the head unit. Does the front bezel just snap off and then I just unscrew it? Also, I am installing a sub as well. I don't know how to get the wires from the head unit to the trunk though. I think it is probably routed along the bottom of the car near the rocker panel, but how would I get the plastic off to route it underneath? Thank you!