playing a tank can be nerve wrecking, the first time i did really bad in a dungeon i didn't pick up tank till 3 months after. But really if you get down to brass tax it's simple cause all you are expected to do is absorb damage and take the main baddie whether that be dungeons or trials, especially in trials your job is easy cause you just focus on the primal and maybe switch with the other tank from time to time, i always thought DPS was harder to play cause more is expected to them such as in Ravana when they have to burn down the butterflies. I would say PLD is the easiest to learn, basically pull a mob, flash, flash again and then go through your combos, DRK is also easy Unleash, unleash, combos but you need to be able to manage MP. WAR...a little more complex