If you're unsure about your party, jobs with high magic are recommended defensive-wise. If you're going with Warrior(s) or Cat(s), have at least one healer and keep everyone's HP above half (or above 75% preferably for the low magic jobs). Relationship skills at that point in the game (assuming you didn't change your main party) should hopefully cover the offense side.
To further reduce risk, an Elf with at least Forest Aegis (if you have one) is good too, preferably player-controlled, to help cushion damage.