Perhaps trying some of the on-line open courses at universities of interest to size up offerings relative to interest. Would like to say figure out 'challenge

Perhaps trying some of the on-line open courses at universities of interest to size up offerings relative to interest. Would like to say figure out 'challenge level' but, introductory / lead in courses tend to be more get up to speed in given area. aka jumping in to deep end of pool or 1ft wading area.