You can't have any of the Chrystiruim (Sorry spelling) fully done as they are locked until you beat the game. However all the useful moves for lightning, fang, vanille etc are at level 9.
It depends on who you use, and what strategy's you're trying to do. Just try it, and if you die, you can CP farm in orphan's cradle (I think it's actually better as theres things that give you 32000 CP at a certain place in the chapter). Read a guide as to what, and where as I forgot.









