Cool, I finally finished them and unlocked them. I am a little worried that my main is a tank, but I haven't really played with other people yet, so hope I can tank okay for regular players. So far I've done NPCs for all but one dungeon.
You'll do great! People generally anticipate big pulls from tanks, so don't stress if you die at times. As long as you're using mitigation and not standing in Bad, it's mostly on the healer to keep you up. Stay positive and communicative and you'll be fine :)