You decide that it would be best to change the costume wearers physically only. You didn't really know how to write down a personality change when using the TF-Note, so it would be better to just change them in there physical state, like you did with Brooke, Mrs. Gretchen, and especially Natalie at your school.
Of course on Halloween it will be different. You will change the people you know from a far away distance, while writing their names, and changes down, and watching them transform in front of you. It would be breathtaking to see if you find the right place to do it. "I'll just do it physically," You explain. "A ton of people would want to know what it is like becoming what they are dressed as, so I believe its time to give them all a complete experience when I write their names down."