Dont worry to much Id say.... I got to main WAR pretty much after hitting level 50 on it started with tanking CT for FC runs then got asked to join a FC raid for T1-4 (2.1 that was) with i76 was one of the highest geared tanks in FC but I personally always felt like a noob. But I managed to tank Cads split with being at 70% hitrate (youp I had no clue bout accuracy needed).
If you wanna start easy go first coils 1-4 try 6-8 and maybe T5 and 9 (havent tanked T8 n 9 thru myself as now maining heal... I have a personal gotta tank gotta DPS ranged/melee). Try EX primals.... I wanted to try tanking T10 i just went into DF with a friend... we killed (oneshot even) even tho my adds crakle hiss hit the other tank. I was excited but I just slammed my face into it.
Just dont worry try and have fun