Sitting down in a chair at the Changing Hands Bookstore, Rex Chapman gazed at a near-filled audience who were on hand to support his first book, “It’s Hard for Me to Live with Me: A Memoir.” Chapman’s eclectic group of fans – including those who have known him from his University of Kentucky days, others who watched him with the Phoenix Suns, the legions who now follow him on social media and his family and friends who stood by when he hit rock bottom – had come together Tuesday night for a conversation of humility, transparency and, in some cases, regret…