Confession and the Eucharist are two sacraments that should pervade the entire preparation of catechetical groups for the First Communion in parishes. The celebration of the First Holy Communion is a joyful, important, and great event in the life of the first communicants, but also in the life of the parish community. For the celebration ceremony of the First Communion to be truly a celebration for the first communicants, their families, and the entire parish community, it is necessary to design, plan and program a systematic, quality, and above all a life and faith enriching preparation for the sacraments of Confession and Holy Communion, or the Eucharist, which should include all the necessary participants of the preparation. Therefore, the first part of the article talks about the participants of the preparation for the sacraments of Confession and Holy Communion: first communicants, their parents, the parish priest, catechists in the parish community and religious instructors in school, and the entire parish community.