Looking back now, Jamie Lynn Sigler can name one project she wishes she had walked away from, but not the moment she finally stood up for herself. "I had to take it out of [my memoir] because it was just too long, but I wrote a lot about when I played Heidi Fleiss," Sigler, 44, exclusively shares in Us Weekly's latest cover story. "I had a long chapter about that and how much of a bad experience that was for me." Sigler, whose memoir And So It Is...: A Memoir of Acceptance and Hope is out May 5, explains that it was "a very fragile time" for her.