Candidates can overcome self-doubt during UPSC preparation by employing several strategies, including positive self-talk and setting achievable goals. Building a stable support network of fellow aspirants and mentors can provide encouragement and different perspectives. Regular self-assessment through mock tests and reflective practices can help in identifying strengths and acknowledging progress. Mindfulness techniques, such as meditation and visualization, can also reduce anxiety levels. By focusing on their journey and maintaining a balanced approach to study and rest, candidates can bolster their confidence and resilience throughout the preparation process.