Entrepreneurs can implement lean principles by: 1. Starting with a Hypothesis: Begin with a clear hypothesis about what the customer needs and how the business can meet those needs. 2. Creating an MVP: Develop a Minimum Viable Product to test the hypothesis with real customers. 3. Collecting Feedback: Use surveys, interviews, and analytics to gather feedback and measure customer response. 4. Iterating Quickly: Make adjustments based on feedback and quickly iterate to improve the product. 5. Focusing on Metrics that Matter: Track key metrics that indicate whether the business is moving in the right direction.