I applaude you for wanting to improve as a tank. I was a main tank for years on World of Warcraft. I loved it up till ppl were being rediculous and would get mad if I couldn't pull an entire room or two and survive. I'm a lv 20 PT and do flashpoints everyday but only as dps. Not sure if I could handle being a main tank on here. I'm a casual player and therefore don't usually have the best gear for tanking. Like everyone else said just keep practicing with these flashpoints and I'm sure you'll make a fine tank.