Dashes are a little different in the F150 vs the Expedition.
I dont find much on replacing one in a full size ford, but here's a nice write up for an Explorer that should give you an idea of what you could be in for.
I dont think its a terribly expensive part, but labor is the killer

How To: Replace Blend Door Actuator in 3rd Gen Ex. - Ford Explorer Ranger Enthusiasts "Serious Explorations"®