You have princess sara healing you every other battle or so, it shouldn't have been too problematic. Wightslayer and Holy Arrow should make a quick work on the monsters iirc, and anyone not dual-wielding awesome knuckle+sword should stay in the back row. Shields are for pussies.
I still agree that FF3DS is pretty shitty. This part is still pretty okay to be honest, I still can't get over the awfulness of the 'dragon god's mouth dungeon that requires you to be mini and pretty much useless unless if you invested everyone in spellcaster(red mage) class beforehand'
Go play FF Dimension, better class system on par with, if not slightly better than, FFV's class system.