Ask HN: First time at defcon how paranoid should I be?

This will be my first time at defcon, and all I hear about is the mythical hacker who can get all your creds from your phone unless its turned off and wrapped in tin foil.

I am just trying to figure out what sort of protections I can take that will really help vs what won't and isn't necessary.

For reference, I am already using a vpn, but plan on being in airplane mode for most of the time on both laptop and phone. I happened to have an old phone that I am using for a burner, and an old laptop for the same purpose. Is there anything more I should be doing?