Anyone can pick up a book from a bookstore and read up about hypnotherapy and gain knowledge. But, is knowledge enough? usually not. Hypnotherapy is a vague field where there are no blakc and white areas. Oftentimes, there are contradictions in different schools of thought. You should aim to get as much experience as fast as possible. Only then, you will be able to make decisions for yourself and what principles to follow. A hypnotherapy training course alone will not give you the experience needed to become an excellent professional. In a nutshell, knowledge is no substitue for first hand experience.