From the “random things found on the Internet” department comes this WikiHow article:
Appear worried on the night of a full moon. Remember, you have to change that night. Do not make people think that something really bad is happening and don’t lie. So, just excuse yourself and disappear somewhere where no one can find you. (If you’re younger, let your parents know, though or they might freak out and call someone.)
When you sleep, sleep in wolf positions. For example, curl up in a ball in a dark corner.
Make sure you can pull it off. Practice growling. But don’t put a werewolf costume on or anything.
And finally, a word of advice:
Never take acting like a wolf too far, or people will think you’re crazy.