Synopsis from Goodreads

Mean girls are always the haters - Right? Hailey Harper has always felt invisible. Now her dad has a new job and the family is moving to Hollywood. Just what Hailey needs: starting a new high school. As she's packing, Hailey finds a journal that belonged to her older sister, Noel, who is away at college. Called "How to Be a Hater," it's full of info Hailey can really use. Has Hailey found the Bible of Coolness? Will it help her reinvent herself at her new school? Will her crush notice her? Will she and the other Invisibles dethrone the popular mean girls? After all, they deserve it. Don't they? Caprice Crane's funny--and deeply felt--observations about high school, bullies, popularity, friendship, and romance will leave teens thinking...and talking.