Confidence comes from practice, practice, and more practice. Although I began doing readings with a Tarot book in one hand and reading the meanings to friends as I went along, I found this unnerves people even friends. So if you are a novice or just learning cards, let your readee (the person getting the reading) know that you are still a student and be very clear about it. Also, ask them to relax and enjoy the reading. This will help create and better rapport and psychic connection with them.