Terrified...

[Esp]

OP should play whatever they enjoy. Regardless of content the people that enjoy their job are typically more motivated to play said job correctly and/or to the best of their ability.

I agree with this 100%. Pick what you like. Regardless of whatever tanking role you choose, you are going to need Provoke at some point, so my own personal advice is why not start out at least with PLD, then once you have that ability, try ALL of the other tanks and see which one you would like best?

Each tanking role is different than the others, so I say once you have reached the final ability you can cross-class, switch out to another tank and try them out. xD

Worry about the Pros and Cons of each tanking class later on once you have gotten the hang of positioning, it's ability toolkits, and holding aggro. Also, ask around your FC, LS or even a few guides here on the forums for any advice you might need. Plus, don't let the DF baddies get to you, just do the best you can to the best of your ability, no one can ask for any more than that xD.

Good luck with whatever you choose, and for the most important part people forget now a days....

HAVE FUN!!