Unlocking Dark Knight?

[Xilibrius]

I'm sure this has been asked a billion and a half times but I haven't found anything from the devs on it yet, maybe I missed it. So we all know there is no base requirement for the new jobs and since they're jobs and not classes means ten to one you can't just create a new one and start at level thirty. My question is will you be able to pick up the job once you hit level 30 or will you have to level to 50 finish all of the main story quests up to 2.55 get into ishgard and then hunt down the trainers to become one getting knocked back down to 60?

If its the latter that's a pretty harsh requirement having to effectively level 80 or more times start to finish (50 to get to Ishgard plus job requirements and then another 30 to max once you get to the job) I'm really hoping they clarify how it's going to work so I know what I'm in for.