I felt the same as you, Heal_bot. Got bored with healing back in 2.1 and then just thought I should bite the bullet and try tanking. Levelled both PLD and WAR at the same time. Saves time and money as both shares the same armor.

As for the anxiety, it is more or less on how familiar you are with the dungeon. For new ones, I always go in as WHM first to understand the mobs and directions. Once I've gotten those facts, in I go as WAR!