Mages. The squishy ones. Don't really have great survival options like Second Wind or Bloodbath. Arguably, BLM's Manaward is comparable at least, but, beside the point.

Nothing really wrong with having a guide. Someone somewhere might find it useful.

That said, didn't have great trouble myself as BLM. Playing any of these types of quests and such as a "squishy" just comes down to knowing how to adapt to solo stuff to survive.