If you use your MP efficiently you can make it through each area and defeat it's boss without grinding. Worst case scenario you have to use a Chimera Wing to TP back to town and you give it another go but I never really "grind" in DQ games, as in pacing back and forth a high XP/Gold area. It's differect from FF where you really only use nukes and heals, and the generous gold allows you to stock up on near-infinite potions. DQ is more about resource management and seeing if you can complete each dungeon in one shot.