Components of developing effective presentation skills for the UPSC Mains interview include strong verbal and non-verbal communication, active listening, and empathy. Candidates should practice clear articulation of thoughts, tailoring their message based on the interviewer's cues. Mock interviews can provide a safe space to hone these skills while receiving constructive feedback. Additionally, being well-informed about current affairs enhances confidence and allows for more fluid discussions. Developing a calm demeanor and managing anxiety also contributes to a polished presentation during the interviews.