I like to tell everyone, quite honestly, that the first couple of weeks will probably suck. Of course, it's different for different people, but the first two or three weeks are definitely the worst. You're away from your family (often for the first time), thrown into a place where you don't know anyone, doing a job that is strange. And if you're like me and have been unemployed for some time before your program, then the pace of it takes some getting used to. In my first few weeks I seriously thought of quitting, but I told myself to stick it out a while and see if it doesn't get better, and it did get better. Just be prepared for the fact that it may not be as fun and magical as you expect, at least starting out. It's hard work, it just happens to be in the happiest place on earth.