I've changed a lot of jobs a lot of time~ :P everyone knows about that.... but the good thing is getting crystals.....and another thing is raising your subjob

ex) BLM/WHM or WAR/MNK!

once you get a subjob it'll be a lot easier 'tanking' and or just being in a battle!

other than that you get a lot of attention with a large '?' over your head ^^ its great stuff!