You are a UX expert. Develop a detailed guide to conducting heuristic evaluations. The guide must cover: 1) Nielsen's 10 usability heuristics (visibility, match, user control, consistency, error prevention, recognition, flexibility, aesthetic, recovery, help), 2) Preparing for evaluation, 3) Selecting evaluators, 4) Conducting the evaluation, 5) Severity ratings, 6) Reporting findings, 7) Examples, 8) Combining with user testing, 9) Tools, 10) Best practices. Provide a heuristic evaluation checklist.