One of the coolest things we learned was how to let the oils introduce themselves to us. You put the oil under your nose and allow the fragrance to introduce itself to you. It was amazing to see what your first response was to the oil. I think that is why I like some oils better than others. Some seemed happy and fun and others were more serious. By that I mean I LOVE neroli. It is my happy oil. I had one prior to that but when I discovered neroli, it took the cake. Still is today! The more serious oils were the medicinal smelling oils. I love them also but they put me in a different mind set. That is what is wonderful about the oils. They bring a part of themselves into your life and you feel it instantly.