We had a whole litter of them under our front steps a few years ago. They didn't really smell too much, probably because they were comfortable. Then we started smelling it a lot more, mostly in the basement. It took a while but we finally figured out one had fallen in the window well outside the house. We got him out with a 5-gallon bucket on a rope, with some bread and cheese inside.
I don't know too much about skunk behavior, but this litter of skunks seemed to be keeping a series of burrows around the neighborhood and they would forage at night and move on every few days. We waited until they seemed to be gone, and then I dug a trench around the front stoop where their hole was and buried a stiff wire screen that kept them out (Ask for 'hardware cloth' at the store). Good luck!
Oh yeah, and we straightened the cover on the window well so they wouldn't stumble into our booby-trap again.