I know this is slightly off topic, but ill throw in a little side response here.

At its basic level, BLM is super-simple. You have 2 stances. Umbral Ice improves your mana regen(to the point that with 3 stacks you get all your mana back in 2 server ticks even during combat) while Astral Fire improves your damage output. So you cast your fire spells to hurt the enemy, and when you run out of mana you stance switch to ice to get your mana back, then switch back to damage. You have 1 DoT(thunder), so you do your best to keep it running as much as you can. You start getting your aoes at an early level(the main one coming at level 18), and in multi-mob fights its usually best to use them(with 2 targets your single is about equal to your aoe, with 3 targets or more aoe is best). You have a few other tricks(you are a mage afterall), but just getting that much right consistently will put you at 85+% for most of your career. Then once you hit level 60 you learn buff management because the Enochian buff is required for your strongest spell. At 60 its still fire to hurt vs ice to regen, but now youre juggling buff timers and theres more to keep track of. It ends up being super easy to learn, but with a ton of incremental improvements you can make to get better and better.