There's not a lot I wish I'd done differently. I think that a lot of the low-level throwaway side-quests lose any sort of impact once you get your first 50 so I'm glad I did them as I was levelling PLD for the first time. Given how rubbish WARs were initially, I'm glad I waited to switch to WAR tanking.

Maybe I could've focused on one class and dumped all my soldiery into that (right now I'm half-BLM, half WAR/PLD), and some days I question whether or not I did my animus on the right class but tbh, something that a lot of people in the game forget it's not a race and it's not going anywhere anytime soon so you have plenty of time to level stuff up. I just love that you don't have to make a billion characters in order to play all the different classes.