Unlocking the job isn't the tough part. Fully catching up is- and that's with the level 50 quest that gives the final job skill. Pretty sure the entire AF set is given with the lv 50 quest as well. They've said you can equip any gear the class can equip while on the job so until you finish the level 50 quest you won't have the AF gear.

That is what I've understood from the info we've gotten so far, both explicitly stated and more implicit wording.