Learning Spanish

My brain is fried after four days of learning Spanish. I begin each day with a private tutor, and then I work in a store and speak with the staff and customers in Spanish. While my training is in English, most people only speak Spanish so, like last night when I went out with some people from work, I spoke and listened to Spanish the whole night. It is a great experience and I know I will learn a lot, but boy is my head tired.