PICU clinicals

This is my last semester of nursing school and I'll like to give a good impression to my clinical instructor. I was assigned at PICU for one week. How should I prepare myself for the PICU, what types of skills should I review. I heard from other students that my clinical instructor is very tough and expects us to know our stuff. I'm worried because I have never been in a unit with little people !!!! The PICU is a whole different world HELP