The Confiteor is prayed twice, first by the priest to confess his sinfulness, then by the server with whom we unite our hearts to confess ours. Both assume the posture of a profound bow while asking God’s forgivenss. We recall our Lord dropping to the ground and sweating blood as He assumes the weight of our sins.
P. I confess to Almighty God, to Blessed Mary ever Virgin, to Blessed Michael the Archangel, to Blessed John the Baptist, to the Holy Apostles Peter and Paul, to all the angels and saints, and to you my brothers and sisters, that I have sinned exceedingly in thought, word, deed. (He strikes his breast three times saying) through my fault, through my fault, through my most grievous fault, and I ask Blessed Mary ever Virgin, Blessed Michael the Archangel, Blessed John the Baptist, the Holy Apostles Peter and Paul, all the Angels and Saints, and you my brothers and sisters, to pray for me to the Lord our God.
In the N.O. the priest and the congregation face each other while doing a “Penitential rite” together. A shortened Confiteor is one of the options.