How did the coach buit a swimmer?

The coach realises the depth of hydrophobia engraved in the author's mind by this time and he proceeds to eradicate this fear in a step by step strategic manner. He does not rush in his swimming lessons. He starts by teaching him to walk across the pool tied to a safety rope whose end the instructor held. They go back and forth for days ..The instructor makes him practise this for days. Then when the tension in the author slacked a bit , he was taught to put his face underwater and exhale . Next he taught him the footwork. He made him practise for long hours at each stage . Thus bit by bit the instructor bulit a swimmer in Douglas .