As I've been Warrior from 2.0...
with all the changes they have made...
It's really easy to tank now.
Keep iron will(or your job tank stance up) up at all times, the only time this doesn't apply is Endgame Raids content, and you will know by then when and when not to have it up or you will learn quickly.
Read the tooltips and understand what they mean for your rotation.
Provoke is basically useless outside of the endgame tank swap.
Have fun as you get more confident. you will learn how to tell when your party can handle big pulls.