IMHO I found Disney World to be a great training ground on how my daughter could cope on her own and also how I was able to handle it. We started at the age of 9 in Epcot, being separated but within eyesight 15-20 minutes at a time. When she was 13 and wanted Chinese food instead of Norwegian we sent her off to the next country to order on her own and bring it back. I considered this practice to when I had to send her off to high school this year taking public transportation, which had me in a panic. I still worry a little bit but the practicing in WDW helped alot.