I get tanking nerves when I first start tanking after a long break, but eventually find my groove. The nerves come back if we wipe, even because of someone else's mistake, but they disappear when we complete a dungeon successfully. Like someone on the first page said, "Queueing as a tank is putting myself in a position where I feel directly responsible for the experience of four other people, and that's paralyzing for me." I still do it, though, because I love to tank as a change from ranged DPSing.