Tanking Endgame content comes in "layers". You should not be so nervous -- your raid leader is right, there is no better way to learn to swim than to get into water deep enough for you not to touch the floor. Just don't go TOO deep, so you have a safety net



Turn 10 is absolutely perfect for that. With close to i130 gear, echo, staying in your tank stance, you have a huge huge huge margin for errors. Dps won't be an issue either. Hopefully you go Pld -- if you plan on going war, go pld first until you are comfortable with tanking. It will be much much much easier for you to learn.

With Pld your rotation will be 123123123, so you can do that mindlessly and just focus on everything else. You will need to do mechanics, but that is the same than any other job. Now you will need to focus on 2 things: tank swaps, and CD use. The good news is, with echo, 130 gear and on t10, if you miss a CD, you will survive easily, so you have training weels. When critical rip happens if you MT, stop hitting 123 and hit a CD -- rampart or sentinel or hallowed ground. If you need to go take a charge and you are MT, go around the boss, focus on not moving it, stop hitting 123 and just focus on your position. Once you are behind the boss, hit a CD button. Let the other tank focus on grabbing agro.

If you are off tank and need to take the boss, go in front of it before you have it, then hit provoke, and start doing 123.

When adds come, go exactly inbetween them (you should have a circle showing you where), and spam flash. Use it 2 times, then move a bit north, and use it a bunch more, then start doing 123 combo rotating between the two.

All of this is COMPLETELY overkill and suboptimal by a wide margin. But it will get the job done. Once you do it enough, you will start getting your "stage fright" off, and start optimizing stuff. Before that, just overdo everything and focus only on what matters -- using CD when needed, grabbing agro when needed, everything else be damned. Soon enough you will feel more comfy.