Your best option is probably changing into any creature, if you have a statuette for transformation. Shadow potions (do you have alchemy skill 1, in which case you could mix yourself some) will work also.

It's worth coming back later at higher level (20+) for the lower dungeons (much exp and treasures), and for the sword required for the holy item quest.

In times of crisis it is of the utmost importance not to lose your head (Marie Antoinette)