Horse riding is a fun and rewarding activity that can be learned without a trainer. It requires patience, dedication, and research to learn the basics of riding. The first step is to find a horse to ride. Other important steps include learning general horse care and safety, understanding the basics of riding, and practicing as much as possible. Additionally, it is important to find a knowledgeable mentor and join a riding group to help with the learning process. With the right attitude and effort, anyone can learn to ride a horse without a trainer.