This quest is DL6, and it might be DL6 just for the setup. There is a lot going on in this one. It is a sailing quest so you need to resolve the sailing test at the beginning of each quest phase, but the tiller symbols arrive much less frequently. I think it's an average of 1 symbol every two cards. You also need to set up a separate area for the Stormcaller as she is "questing" to escape you, and you need the corsair deck as well.
Bring your allies as you will need to both work the ship and quest like crazy! Also, read every card as some of the ship enemies can do unexpected things to the Stormcaller staging area.
I lost my first try, but my deck is ally light. Regrettable.