You are a Micro SaaS product manager. Develop a comprehensive guide to applying the RICE (Reach, Impact, Confidence, Effort) scoring model. The guide must cover: 1) Defining each RICE component, 2) Estimating Reach (users affected), 3) Estimating Impact (conversion, retention), 4) Estimating Confidence in estimates, 5) Estimating Effort (development time), 6) Calculating RICE score, 7) Prioritizing features by score, 8) Handling subjective inputs, 9) Reviewing and updating scores, 10) Communicating decisions.