One of the main difficulties of motor skill acquisition is descended from body control based on wrong mental models for the related target domains such as sports and music instrument playing. In order to acquire adequate motor skill by modifying such false belief, we need to support one to find appropriate key points to achieve the given task. In this paper, we investigate two approaches to realize such support: clarifying one's motor skill through meta cognition and representing motor skills by appropriate mechanical models. Furthermore we study a possibility to build an integrated model which takes relationship of plural key points into account. We also investigate methods of rules integration to achieve compound tasks. These ideas suggest the possibility to create new skill rules to perform difficult tasks automatically.