No, a person might not even know they had force powers without training starting at an early age. training was definitely necessary at first for both Sides. After intially obtaining powers additional training on the light side was need to help keep from going Dark side.Not at all. In fact, the Force has nothing to do with the Sith and Jedi orders beyond both organizations membership is comprised entirely of people who have the ability to use it in some capacity. Someone could learn to use the Force at a high level if they had access to the knowledge. The issue is that both orders hoarded holocrons and other materials on the subject in an effort to try and control what information was out there.