Article continues below advertisementShamed Sarah Ferguson is weighing whether to proceed with a high-profile television interview, and Prince Harry is ready to advise her if she chooses an Oprah Winfrey-style sit-down. That possibility has prompted unease across royal circles, where insiders say Ferguson's turbulent past and long memory make her a uniquely unpredictable ­- and potentially compelling - TV guest.She has been approached by several major U.S.