It studies how individuals change over time and that processes that create those changes. Basic importance of development psychology is study of life. Development refers to the changes over time in the body and in the thinking or other behavior of a person that are due both to biology and to experience.
In case of a fresher how long does it take to become an anesthesiologist varies to that of a Doctor and requires around twelve years. Four years for undergraduate studies, course including organic chemistry, physics, math, anatomy, biochemistry, and molecular chemistry and then four year of medical degree.
Read read this first--FAQ about being a CRNA at the top of the forum. It will answer most of your questions. I might point out a few things. The training and experience you will need will take you many years even with your previous classes(4 year BSN and 1+ year ICU experience and 2.5 - 3 years anesthsia school. I'm not sure were you got the idea that learning how to deliver anesthesia or save someones life was not hard work. You will put in many hours.