What is the main conflict in The Man Who Listens to Horses by Monty Roberts?

The Man Who Listens to Horses is the true story of Monty Roberts who bills himself as a "real-life horse whisperer." Monty details his life story, describing in detail how he cultivates his unique philosophy for working with horses. The book begins with Monty's childhood in Salinas, California and covers the most significant events in his life that shape his profound insights.