failure of the pilot to follow procedures/directives by flying in instrument meteorological conditions (IMC) without proper training/certification; and his failure (or inability) to follow proper IFR procedures and maintain proper altitude during an instrument approach, which resulted in a collision with obstacles (trees) and the ground. Factors relating to the accident were: darkness, instrument weather conditions, and pilot impairment from use of a medication that is not approved by the FAA for use while operating an aircraft.