First forum post so I apologize if anything seems off with my post, feel free to point anything out too.

I recently picked up both DRK and PLD and I know how to tank in dungeons, but tanking in trials seems intimidating to me still due to the presence of two tanks. I have some basic ideas of what to do, that the off tank acts as a DPS and back up tank incase the MT dies in most dungeons, and im pretty sure I get how to tank swap (MT shirks, OT uses provoke, MT disables tank stance, correct?), but I still have a few questions.

1. Is that how you tank swap correctly? Did I miss anything?

2. What about tank stance? Does the OT leave it on after the MT gets all the enmity after a few seconds? Or does the OT put it on only after tank swapping?

3. What determines the MT? Whoever rushes the boss first?

4. What are some signs that I should tank swap? What are some trials that involve tank swapping?

5. Is there anything I can do too be a better tank in trials? Sorta like a set of unwritten rules? Common etiquette?