Like Joanna said if you go down with a positive attitude about everything you will be fine. If you go down to party and not do any work this is not something you want to do. Disney is very strict about their guidelines and if you do not follow them you can be terminated. As long as you realize you will be working crazy long days sometimes 16 hours a day in 100 degree heat and you are okay with that, then do the program. I can tell you from my experience that there are times when you wonder if this was a good idea to do but overall it will end up being the best experience of your life. The plus side to working the crazy hours is you get in the parks for free, which you will want to take advantage of when the parks are slow and you are only working 30 hours a week. And when you are able to put Disney as a previous employer on your resume it gives you a HUGE boost!
Good luck and I hope that helps.