I'm not bragging but they're too easy to substitute.Just focus on the game.I'm too used to substitution jutsu and they were just too simple.Just place your fingers at R2 and L2 and always press them together so that you can substitute easily.You might slip sometimes but trust me.You can substitute just fine.Good Luck!!!!
It's actually really easy when you learn when you have to press the buttons. I had problems before with them too but now I find it easier with them than trying to pull it with someone else.