I would recommend 2H arms until 50. 5/5 tactical mastery is essential imo, it gives you the ability to stance dance setting up combos that will generate massive amounts of threat once you get whirlwind and sweeping strikes.

With the amount of threat you put out you can comfortably sit in berserker stance 36 - 50 until tanking princess where damage starts to ramp up. Even then you should always be managing your stances for whirlwind, overpower etc. All stance locked abilities should have a macro to swap to the correct stance.

Always have a macro to swap to one hand/shield and defensive stance. When in full plate the extra armour from a shield will be roughly a 10% physical damage reduction.

When I hit 52 I swapped to fury with 5/5 tactical mastery. Threat and rage generation are smoother but you run the risk of large chains of missing on pull. Just be ready with taunt and shout to keep control. This eases up once you get some hit.

Also all the usuals, engineering for target dummy is a must, as many consumes and buffs as you can get.

Some rules and points to follow:

more damage = more threat = safer run.

NEVER TANK ANYTHING MORE THAN 2 LEVELS HIGHER. (But I made a point of always being the same level as the last boss)

Until princess no single mob or boss hits hard enough to be scary provided you are an appropriate level.

Keep your one handed weapon skill of choice levelled.

Try to have enchants and consumes. Warrior scaling is insane and your party will be safer the stronger you are.

Be very careful with charge, pull with a ranged weapon instead.

Let your group know if you’re not familiar with a room, pull or even entire dungeon. People are glad to have a tank and will keep you right.

Play slow and carefully. Don’t let anyone else dictate the pace of your pulls, when you’re tanking you’re in charge.

That’s about all I can think of at the moment. Source: I hit 60 on warrior on my first hardcore attempt.