Intravenous therapy training is an important part of obtaining medical certification. When operating with physical human patients, the necessity of knowing exactly what you are doing is quite high. This is why the most difficult and high-paying jobs are medical. An entire culture exists around the brilliant and oftentimes mentally troubled medical community. Seeing people die under one's hand and coming to grips with the mortality of humans takes very tough skin to deal with, as well as a steady and well-trained hand.