Not sure what the Dominican manner is, but I think I got mine from St Louis-Marie. I start it as if I was starting the Office with 'O, Lord, open thou my lips', etc.
Sounds rather close, im wondering if the method of beggining the Dominican Rosary Predates the more common way of starting with the Apostle's creed etc.
Ive posted the Dominican opening:
In the name of the Father and of the Son, and of the Holy Spirit. Amen
V. Hail Mary, full of grace. the Lord is with thee.
R. Blessed art thou among women and blessed is the fruit of Thy womb, Jesus
V. O Lord , open my lips.
R. and my mouth shall declare your praise.
V. Incline unto my aid , O God
R. O Lord make haste to help me.
V. Glory be to the Father, and to the Son and to the Holy Spirit,
R. as it was in the beginning, is now and shall be, world with out end. Amen. Alleluia. [in Lent, instead of Alleluia: Praise be to you, O Lord, King of eternal glory.]