It’s an annual dilemma: What’s an appropriate holiday tip for the people who serve you throughout the year? Etiquette expert Peggy Post recommends a gift of a week’s to a month’s pay for full time help like a nanny; and the cost of at least one visit for people who provide a regular, less frequent service, such as a hairstylist. But you probably also want to keep in line with what your neighbors are giving so you don’t look like a tightwad… [...]