Also one with arthritis might try some open tuning stuff, something that may require less fingering. Not to say that all open tunining pieces are simple, that is far from the truth, but i imagine one could 'strum and barre' to accompany oneself. And i agree with trying to hold the guitar in different positions and modifying the classical one. Silk and steel type strings may also be worth trying, although they are not my preference, they are easy to play.