I suppose the most challenging thing on my end was entering all of the student and faculty/staff names in the form as options in a drop down list. Unfortunately the school roster that I received for our business office was alpha ordered by grade level, which meant that the names in the drop down list weren't alpha ordered across grade levels. This presented a few challenges to the girls as they entered sale information into the form. Finally, one other thing that I learned is that the forms can select at least 429 options in the drop down list (I was a little worried that there would be a limit on the number of options).
To borrow a phrase from Lee Lefeever at the end of his awesome Google Docs Commoncraft Video, "Google Docs Rocks!"