I need HELP! ADVICE! (try to finish FFX before 12am)

[Vis Major X]

I only rented it so I could enjoy it.. I do this every few years.. get one or two good adventure games and just play the hell out of them.

I have a couple questions.. I'm not going to make my move until I get some suggestions..

I'm already at Zanakand. But it was too hard so I turned around. So now I'm monster arena'ing and I've got a bunch of gifts for the work I've done so far. Now what I'm asking is ... What is the BEST USE for these things to END the game?

What... weapons and armors can I get or make for WHO and WHAT to give myself the easiest time with the final bosses?

This is all I'm concened about at this point.. I just want to finish it without late fees.

So WHAT armor and weapons that are ... medium level difficulty to customise or build (I'm really short on the grenades to make the PROOFS or the STRIKES.. but I'm pretty sure these are what I will need to get to the end.. because what happened during my battles is I was getting nailed by ailments and couldn't survive) so I can beat the bosses without getting killed before the 2nd round?