Are you scared because of the 'tank' aspect?
I'm main spec tank and it's actually the easiest role to play.
From hard to easy: healer > DPS > tank.
It's far harder to maintain 100% uptime of buffs/debuffs and deal your maximum possible damage on DPS jobs then tank jobs. Certain DPS jobs have it easier then others but tank is still easier vs all DPS jobs so far in the game.
As for the actual tanking aspect, Reprisal, Rampart and your other mitigate CD's are all oGCD, meaning you can just weave them in during the GC while you're doing your DPS combos.
Emnity has never been an issue and with SB we now even have Shirk, I could just like AFK the fight and don't loose emnity.
If you just don't like the play style of tankjobs then of course that's another story (but why would you be sad then for a job in a role that you don't like in the first place?).
But if it's just because you're 'scared' of tanking just go ahead. It's super easy and you never need to wait and can be that friend with benefits (instant dungeon service).
