To people who tank a lot, do you reposition yourself through back pedaling or not?
Yes, being able to slightly adjust the boss position for ideal placement of your melee behind the boss is a best practice. Even in LFR. Seen other tanks on Avatar, stage 2, not even pull the boss to a position where melee can hit it without standing on the tank (they leave him standing in the green). Stupid stuff like that is bad tanking.
I may actually give tanking a shot on one of our fun runs. Bears are stupid easy, so as long as I don't fuck up a taunt, the rest of the tanking mechanics are straight forward in normal.