Coleen Harty of Madison, Wisconsin, has spent years perusing the vast category of personal growth books and tapes. Beginning March 1, she will be putting her knowledge into practice and helping others navigate the self-help arena in her own bookstore, Invest in Yourself. Harty, a long-time employee of the Middletown, Wisconsin-based Pleasant Company, founder of the American Girl dynasty, is opening the 1,500-square-foot store, also in Middletown.