When it comes to following a set of rules or instructions, there are plenty of synonyms for "follow the book." Some similar phrases include "stick to the script," "adhere to protocol," "do everything by the book," "follow the rules," or "stay within the guidelines." Depending on the context and tone of the situation, other options might include "play by the rules," "conform to regulations," or "observe guidelines." Whether you're talking about a workplace policy, a sports game, or just a general code of conduct, there are many ways to express the idea of following instructions precisely and exactly as they are written.