Jenny Rae Mettee

I have a 2008 Ford Edge Limited Edition. The other night the touch screen was slashed, and is no longer usable. After taking it to a repair shop, I found out that the whole nav unit must be removed in order to be fixed, unless I want to pay top dollar at the Ford dealership (which isn't an option.) How can I remove it myself without functionality of the touchscreen? Is there anyway to control the system via a laptop and the USB ports in the car?Any help is greatly appreciated