WoD tank as for me is a good starting point to learn big mechanic later on coil raid.
But with the overgear factor, you will not feel much the difficulty there.
Just focus on Big eye boss, Cerberus dog, and that floating ghost last boss.

I'm not sure about the EU/NA, but in Masamune B is main tank, A for belly, and offtank from B & C pull the chain normally.

Don't worry man everything will be OK.