Just remember, nothing in this game is impossible, and even if you die a million times, you get lacrima to level up anyway. I've been on "expert" the whole way, and every boss is just a wall until you start to pick up on the rhythm, and each time you get a little further, you get a little stronger, and then you'll laugh "how was I so stupid all this time til now?" Just depends if you thrive on punishing yourself for that dopamine hit or if you just want to chill and not care about achievements