I would still suggest watching vid guides as well as video of playthroughs from a tank perspective, because there are many mechanics that still need to be performed, knowing where to position yourself, pulling mobs or bosses, and what CDs to use that are still essential for survival and holding hate. You can probably still get away with DFing T1-4 and T6-8 IF the random players are on the same page, but T5, T9, and FCoB will crush anyone who fly in blind, don't pick up fast enough on the mechanics, and/or half prepared.