OK this is prolly gonna sound like a noob question but i dont care lol.im just past the part where you get the light from the fire crystal and am trying to get off the floating continent.but what im wondering is, is it worth it to change jobs??right now i have a warrior, Black mage, White mage and a theif.but it would seem just such a shame to change their jobs after ive gotten them to like job lvl 20....is it worth it to change jobs everytime a new one coms along??i think i may change the warrior to a knight and my theif to geomancer.but it just seems dumb to change my black and white mages cause i pretty much need them.also will there be more advanced versions of the white and black mages??any advice would be greatly appreciated.

thanks in advance
Tyrel