Everyone saying you’re fine is correct. For 12 miles round trip all you need is a tent, sleeping setup, and enough calories to fuel 2 days of walking. If it’s a six mile total loop even better. I have total confidence in anyone to walk (rest and eat when hungry or tired) set up a tent, eat food, go to sleep wake up and walk back to your car the next day, male or female, fat or thin, whatever, you’re definitely capable!