Software engineers often stall by overthinking reversible decisions. A simple 3-question framework helps distinguish between one-way doors (irreversible, high-risk changes like data migrations) and two-way doors (reversible changes like feature flags). The key questions are: impact if wrong, ease of reversal, and ability to mitigate quickly with small blast radius. Practical tactics include using feature flags, canary deployments, proper monitoring, and quick rollback capabilities to move fast while maintaining safety.