I actually like to cure myself as a THM when doing leves. I try utilize/cross-class as many skills as I can when I'm soloing. Without classes I wouldn't able to equip... Protect, Stoneskin, Second Wind, Featherfoot, Cure, Sentinel, Rampart, Sacred Prism... Am I leaving anything else out? Classes in parties can also be very beneficial for the select few jobs that you might be missing in a party. Who wouldn't want a tricked out mage in the mix? =D