Starting preceptorship... nervous

Tomorrow I will get the name and phone number of my preceptor so I can call and start scheduling my shifts. I am so nervous! I've done well throughout the program, but recently had an emotional moment during Critical Care clinical after my instructor asked me a question (that I KNEW the answer to!) and my mind went completely blank... I couldn't hold the tears back and ended up crying in front of the patient's family. It has shaken my confidence. I am working on relaxation and deep breathing to get me through this, but I am still starting to feel panicky! Somebody please tell me something positive about your preceptorship experience.