FINAL FANTASY VII AND LIFE

I just downloaded it on iOS.
  1. I forgot how stressful it is
  2. Is there a treasure box hiding somewhere that I can't see and is totally necessary?!?
  3. If i use this spell now, will I have to use an ether, and if I use an ether, will I be totally screwed when I fight sephiroth?
  4. Basically, this is a metaphor for life.