its only difficult if you havent put the work in earlier to develop your characters, form a battle tactic (same as any FF game really) and get KOTR ..its true that sephiroth becomes stronger as your characters develop but its not exactly substantial. My little brother tried Safer Sephiroth at level 52 and couldnt, but i did it easy at level 76 because I had made LOADS of effort during the game and doing sidequests. so there.