WoW Insider does have a few guides to help beginning tanks, including:
- Learning how to tank
- Things you didn't know your tank was doing From the flipside, but still helpful for newbie tanks
- Observations from a leveling tank Dungeon Finder tips
I've never tanked in the big leagues, but I've tried leveling a few baby tanks through dungeons. First time I ran a 5-man (which was The Deadmines), my gnome warrior accidentally rolled on a ring with intelligence on it. Gear couldn't be traded at this time. I was miserable, as was everyone else. Her first 5-man was her last 5-man.
Another time, another tank kept usurping my role. I was rather testy and we had a couple of verbal scuffles -- until someone pointed out that my role was actually DPS. Oops.
What embarrassing mistakes have you made as a tank? Were you new or a seasoned pro? And tell us the truth: Did you fess up or blame it on another player?