How to get good reputation in Fallout: New Vegas?

I've played Fallout: New Vegas for 248 hours as of now, and I was wondering how to get good reputation with the Great Khans. As of a now I am vilified with them, I want to get up to neutral so I can start the quest Aba Daba Honeymoon, and free Anders from the crucifix. Is there anything I can do while disguised as a member of their clan? I am playing on the Xbox console.