Quote Originally Posted by Orophin View Post
2. You have to complete the level 10 class quest for the class you started as before you can change classes. After finishing that quest, you can talk to the NPC at any of the guild counters to officially join their guild and receive another gear set. Technically though, you only have to buy the main hand for the class you want and equip it, but you still have to finish your initial class's level 10 class quest.
That last part's not true. You cannot simply get a weapon/tool for a new class and equip it until after you've unlocked that class. It's that initial quest at the class's guild that unlocks the class. (Even the starting weapons have a level 1 requirement, and until you've unlocked it, you're listed as level 0.)