Getting the vent assembly down from the dash and removing the 3 vents from it are only a beginning but then pretty much the end also.
Even if none of the chrome fins are broken you're going to find they pivot on sewing needle size pins that are captured in such a way that taking them apart will be a nightmare to reassemble. If the chrome isn't terribly pitted you could attempt to polish them while assembled.
The next year models 3 vents were all plastic construction but left bare black because vacuum metalized chrome wasn't going to stay on them.
Good luck with it.