Not sure what you mean by “do well just going to classes”–usually there will be problem sets or papers and usually these will take more time outside of class than a high school course’s work would. Of course it depends what the subject is and how rigorous the CC is. Our dual enrollment classes are a little easier than AP classes I think, but you can’t just show up for class and not do substantial work outside of class.
OP, if you are interested in UA, you should check out their scholarship offerings and make sure you take a shot at the best scholarships, which are extremely generous.