Class question

[Niwashi]

Once you reach level 15 with the main quest you'll get an envoy quest to visit the other area's. After that you can get another job.

Actually, once you complete the level 10 quest at your first class's guild you can pick up some additional classes, those whose guildhalls you can reach. So a level 10 Arcanist could pick up Marauder, Blacksmith, Armorer, Culinarian, and Fisherman. But yes, it's the level 15 envoy quest in the main storyline that lets you reach the other areas to unlock their classes as well. You'll need to be able to get to Gridania in order to unlock Conjurer.