When you get there you are paired up with a "buddy" and you get a computer work station with that buddy. Every day you have a Diad training exercise, that if I remember correctly, you have to pass with a certain percentage every day. Then, at the end of the week you take a computer test that is about 90 questions and you get 3 chances to pass that one, BUT (from what I heard from other people) if you need some "help" on the last test and have passed everything else they will help you out. I was the first person to finish, but I was told this by people I had been in class with.
As long as you do your work and show that you are trying, then I think you'll be fine. Its not intimidating at all, in fact it was some of the most fun I've had as an adult. Five day "vacation" from my wife and meeting a bunch of new people. Just be sure to be up on time and don't miss the shuttle to the hub. ALSO, in the morning before you leave for the hub you fill out what you want for dinner, and at what time you want it delivered. Don't get it sent up before 7, because you don't get back to the hotel until about 6, and if you request it too early it'll be cold. You should also NOT order their version of a hamburger.....its questionable, at best.
Have Fun