I used a modified version of the tangerine technique to improve my shooting average from the penalty line in basketball. Instead of the tangerine, I imagine a burning candle. When I am about to shoot a ball, I close my eyes, take a deep breath, imagine a burning candle placed at the top back part of my head, then imagine a ball going through the hoop. Then I open my eyes and shoot. This doesn't work 100% of the time, but I saw my performance improve right away.
