Best thing you can learn as an early war is this
Overpowers hitbox is a lot bigger than it looks
Its really more of a rectangle and once you get the feel of that pulling is a synch

Also dont be too in a hurry to pull something
Most dps arent selfish idiots so its ok to lets the enemies buch together behind you before overpowering them all instead of wasting gcds tomahawking them
Beyond that be aware that war depends on its cooldowns more than the other tank
So honestly learn to rely on them now or play palidin. Itll sink in eventually either way

Losing hate mightve been your gear btw
But if it really concerns you so much id suggest running dzaemel darkhold or aetherchemical research facility until youre comfortable enough with big pulls to keep your cool when you need to get hate back

Lastly as someone said pointing at the target you want helps get to it faster
Its not gonna kill someone just cus you didnt pull it INSTANTLY so dont worry too much about it