So how do ya do it?! 
There is hardware that holds them in from the back side. Get behind the dash and remove these screws, then the vent will pull out of the face of the dash.
Once the vent is out and on the bench, use a pair of needle nose pliers to pull out these two press in studs and vent retainer clip.
Once those pieces of hardware are out, remove the push in pins in the side of the vent housing. The internal directional vents will then come out.
At this point, if you are really careful, you can replace vent vanes or control levers as needed. When I had mine out, I sanded down the chrome trim and hand painted it body color. I then reinstalled and voila!
