Review each chapter and ask yourself how late you can start and have the scene still make sense. More often than not, it's later than you think. Readers don't need every intricate detail of the plan. They need the argument over where the plan could go wrong. The same is true for the end. Once the scene has done the work, move on. It's like a work party. You don't want to be the first one there or the last to leave.
This is especially true for stories with thriller aspects. As the novel progresses, the entry point should get later and the exit earlier. By the third act, tighten the screws by dropping the reader into the middle of the action, and then leave on that dangling question that makes them want to turn the page.