I think raiding is the only real tutorial we have.
For instance. I started this game as a White Mage and I wasn't gonna raid, it scared me healing. I picked up Monk with the same stance on raiding and a friend I met pushed me to try raiding, and I thought Monk was fun so I took the plunge. I was SO terrible you have no idea, I did NOT know how to play Monk effectively. Luckily unlike crappy Alexander, the DPS check isn't so much that you give up, we did eventually progress and I'd say I learned enough(pre-HW of course) besides Fracture during Turn 9 to play the class right. And hell, I didn't wanna play Monk right! Those positionals were soo intimidating at first, I literally gave it the finger, but I learned anyway because I was raiding and it was necessary.
Go raid! Put your skills to the test, put yourself in the situation where you MUST get better and seek out advice and watch yourself progress throughout your raid career.