Q: Am I supposed to change my hand positions when I lead the preface dialogue at Mass?
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A: Yes. Look in the middle of the missal for Order of Mass 31, and in the front of the missal at GIRM 148. The first and third look similar, but I usually vary them a bit—extending my hands out toward the people with the greeting, lifting them up for the invitation, and then extending my arms out for the body of the preface and eucharistic prayer.