“One of the best ways to change,” announces Siegel, “is to act as if you are the person you want to become.” His newest book from the author of Love, Medicine, and Healing offers a series of brief, avuncular, often witty suggestions about how to alter one’s life and find happiness. While the prescriptions themselves offer little to quibble with (“Learn what you can and can’t control”), there’s also little enough of substance in his breezy narrative to provide detailed help for someone in real pain. Still, given the success of Siegel’s previous works, it’s likely that his audience, which made those books bestsellers, will turn once again to Siegel for another dose of effervescent good feelings—and for suggestions about what to do when, as he says, “the merry drops out of the merry-go-round.” (Author tour; television and radio satellite tour)