In general, how would you characterize Odysseus' attitude towards his journey to the Underworld? That is,

what does the episode tell us about him?

Odysseus' journey to the underworld tells us that he is a very cautious warrior.

Explanation:

When Odysseus goes to the underworld, his desire is to find a prophet. Odysseus' goal is for the prophet to talk about his future, showing the difficulties that Odysseus will suffer from now on, which enemies he may face, or which beings will try to prevent his return home. Odysseus wants to obtain this information, because he wants to plan strategies to escape all of this in advance and thus prevent anything from preventing his return home.

This shows that Odysseus is a cautious warrior.