Learning Mitigation

[Mantu]

3)There's nothing in game telling you how you should use your mitigation skills properly. I remember back in ARR, when I first tried out PLD I did literally nothing but shield oath and RoH/Flash because I simply never knew when to use cooldowns. I don't think cooldowns are ever talked about in game whether through dialogues, tips or the novice hall or whatever it's called. Even though that's the main thing a new tank should be concerned about.

This was posted in another thread, and it beautifully sums up my problem. I am a mid-level 70 Palladin. I have been tanking since level 17 (first dungeon). I pretty much have never had to deal with damage mitigation. Now that I'm considering doing Extreme Primals for the first time, and Deltascape Savage, I need to have some idea what to do, and I really don't.

Any suggestions on how to learn Mitigation at a late stage?

Thanks,
Mantu