Go VERY early!! If they can handle it, start walking to DHS around 7am. It's absolutely nuts! We went last year and DH doesn't know it yet (his Christmas present) is going next year. Plan ahead on what is most important that they want to do because it's next to impossible to do everything in 1 day. If getting celebrity autographs or sessions are important, you need to be at DHS before sunrise to grab a FP. Only those with FP will be admitted to those sessions and they go very quickly. If they are only interested in characters, figure out which characters and line up early. The Disney characters in SW costumes are near the hat, the more villian type characters (Vader, Darth Maul) are back near the backlot tour ride. Chewy is near ST (his line gets very long, very quickly). If the motorcade is important to see, you need to be on the parade route at least 1 hour prior to get a good viewing space. There are also characters in the "shopping" area that is located near RNR/TOT. The gate that is normally closed will be open and there is a large tent back there with SWW merchandise and more characters.