What if I don't WANT skills on my bar?

[RemVye]

This, there's also going to be 5 job related quests (30, 35, 40, 45 and 50). Even if each one would give you a job related ability you won't run into a problem where you can't fit all the allowed abilities on your bar.

Jobs also have a limited set of abilities you can equip, if any, from other classes. I'd assume for PLD for example you can only equip Glad and Mrd skills (going by their example). And possibly only a select few MRD skills.

Wait and see is always the best answer.