Lifelong friends, screenwriter Tracey Jackson and musician Paul (“Evergreen”) Williams have a lot in common: great wit, great talent, and a gift for friendship. One thing they haven’t shared, however, is addiction. But while Paul spent many years decidedly unsober and Tracey has not, she’s all plenty aware of how we all practice self-limiting behaviors. These two understand each other as only best friends can. (Watch them soon on Oprah Winfrey’s Super Soul Sunday.) Together, they’ve written a book about all the ways we can mess up even the “healthiest” lives, and ways to unmess them.