I took a local community college continuing/adult education class a few years ago to get a refresher in darkroom work (after not having done any in 15+ yrs) and found it to be pretty good. After talking to some people that had take both this and the credit class, the non-credit class seemed to be better. Smaller class, more direct interaction with the instructor, only one (3 hr) class session per week, and access to the darkroom whenever a class was not using it.
I don't remember if TWU or UNT offered such classes. If not, you would most likely have to go to Gainesville (NCTC) or Farmers Branch (Brookhaven)