The Definitive Dark Knight Guide

[Hundred]

I'm thinking about tanking for the first time with this class. Do you think it will be too much starting at 30 and not having the early levels to get the mechanics down?

Doesn't matter the majority of the game is ezpz lemon squeeze. The minority of the game will require much of you.
You can jump into tanking right away if you check out a few pointers to keep in mind and you'll get better as you go through Haukke/Brayflox/Cutters/Vigil anyways. Those lower level dungeons are all to learn anyways. Just remember stuff like returning to position after aoes in general, holding aggro, cycling targets, face enemies away from party and grow from there.

The early dungeons give you your tank stance which Plds don't even have to 40, you don't technically need it to tank anything there but it'll make things easier for a new player to hold aggro anyways. Can basically spam Unleash and run a siphon strike chain for aggro the majority of the game...you could but you shouldn't build up that habit.