Is there a specific mechanic you struggle with? (Not super familiar with the fight, it's been a while since I did it, that the one with Quickthinks and the spiked floor?). If there is, have you tried going DPS with one you are comfortable with to lessen the stress on yourself and the party? Subpar DPS is much less of a burden than a constantly dead healer, and DPS have less mechanics to deal with usually.