Two afterthoughts. I’ve described this before, but it was on the old forums.
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When I decided I wanted to learn how to tank in groups, it was after I already had two characters at max level. Tanking on your first character is not impossible, but it puts a pretty heavy burden on you as a new player. You are already learning the game and the classes; tanking on an “extra class” for a tanking role at the same time is probably not good for most people. Of course, if you have played similar MMORPGs before, you are not a “new player” in the same sense.
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When I did decide to tank, what I did was choose a character from level 1.
I then stopped my XP at level 19, I think, which was a level where I could access Ragefire, Deadmines, Wailing Caverns, and Shadowfang.
I then ran the same dungeons again and again as tank until I had them down cold and had seen a lot of what groups can be like. (Not all of what groups can be like. Even today, some weirdnesses surprise me!)
Then I released my XP and went on to the next batch of dungeons. And so on.
I think I got up to about 50 with Zul’farrak and Stratholme by the time I realised two things: a) I could tank and b) I didn’t much want to tank for random groups - there was rarely any fun in it, and sometimes I got gripers in the group.
At that stage, I of course didn’t know the current top-level dungeons of the time from a tank’s point of view, but learning those was just a matter of running them; I knew I could do the job well enough for LFD, and I had kind of lost interest.
I don’t know whether this method will be helpful for other people wanting to learn, but I offer it for what it’s worth. Classes always change. New Dungeons always appear. But understanding positioning and group cohesion is something you can learn just as well at level 20 as ar level 120, and they apply to all levels.