Life is a series of decisions. Living a satisfying, happy life, then, depends on our ability to make good decisions. Should we meet some college friends in Fresno for a rare get-together even though we’re three months into a get-out-of-debt program and the cost of the trip would set us back a few steps? Should we buy Brand A that’s known for its durability or Brand B that has a much cooler design? Harvard Psychologist Daniel Gilbert, author of “Stumbling on Happiness,” says if we’re relying on our own minds to answer such questions, we’re destined for disappointment.