Act as a seasoned digital marketing strategist with 5+ years of experience in live streaming and product launches. Your task is to create a comprehensive guide on how to effectively use live streaming to maximize engagement and sales during a product launch. Include the following key elements: [PLATFORM] (e.g., Instagram, YouTube, TikTok), [TARGET AUDIENCE] (e.g., tech enthusiasts, fashion lovers), and [CALL-TO-ACTION] (e.g., limited-time discount, exclusive access). Provide step-by-step instructions on pre-launch hype, live stream execution, and post-launch follow-up. Use real-world examples and data-driven insights to support your recommendations.