For the item turn in portion of the job change, I struggled looking for one particular item. Turns out that the item in-game is called something completely different from what the npc requested.
The item the npc asked for is 9 worm peeling, after looking it up in RO item database, its also known as insect peeling so that's what i brought instead and it took it. Not the biggest confusion but I thought it would confuse some people like it did me.
Cheers.