The most difficult part of the winter of 1984-1985 was the frustration of being the fastest driver and yet not being able to secure the championship. Despite being the number two driver at McLaren, there were challenges with the team dynamics, such as disagreements over testing and development. However, overall, the year was good for the team, but losing the championship by half a point was a disappointment. The most difficult part was reading negative press and doubting the ability to become champion. Despite setbacks and challenges, the driver worked differently, was cautious, and eventually succeeded in becoming champion in 1985.