Ensuring you have protective spell cast will reduce the damage he deals significantly. That in itself should ensure your survival... seeing as he isn't hard at all. Guard yourself against Petrify, and you'll not encounter any bothersome moments in that fight.
Are you taking out the Pagodas? I wouldn't really say it was worth doing honestly, unless you can easily take them out twice or so. Might as well give Jecht all you've got (seeing as it's the end), so don't bother conserving MP much.
I wouldn't be too concerned with the Aeon battles. No matter how strong they are, you'll always have some way of beating them; you can't lose.
Also... moved to the Help Booth.
__________________
Jess: She'd cry if she had to drive here. And crash.
The very existence of flamethrowers proves that some time, somewhere, someone said to themselves: “You know, I want to set those people over there on fire, but I’m just not close enough to get the job done.”
- George Carlin