Aspirants can build confidence prior to the UPSC interview by engaging in comprehensive mock interviews with peers or mentors to familiarize themselves with common questions. Preparation through self-reflection helps candidates articulate their motivations, strengths, and weaknesses effectively. Additionally, maintaining an updated knowledge base on current affairs and governance issues ensures candidates can engage thoughtfully. Practicing positive self-talk and visualization techniques can reduce anxiety, leading to a more composed and confident demeanor during the actual interview process, thereby improving performance.