IZJS is excellent. Unless you have some specific questions, about all I can say is that if you played the NA version at all then whatever you might think you remember about loot placement is wrong, and most importantly you need never worry about that retarded "oops, now I can never get the Zodiac Spear" shit again. I would suggest you plan ahead for what jobs you want to give everyone; generally the idea is to have two fixed teams you can swap between once you have all 6 characters. I planned out espers in advance too, but that's not strictly necessary if you don't know that much about the game going into it. If you want to know the exact setup I used rather than experiment with it, I can post that too.
And yeah, Japan's X/O swap is infuriating. At least it's simple to fix for emulated games. What really pisses me off is going from my PS4 to my 3DS and back. Nintendo are assholes who apparently don't feel the need to conform to local standards at all.