This document lists 15 big mistakes or "boo-boos" to avoid when self-publishing a book. Some of the key mistakes highlighted include: being in a hurry and making bad decisions; using an online subsidy publishing company; ignoring library marketing opportunities since there are over 120,000 libraries in the US; not starting marketing efforts until after the book is published; and trying to do everything alone without hiring professional help to avoid costly mistakes. The overall message is that self-publishing authors should learn from others' mistakes in order to have a successful book launch.