Before Novena prayer for Annuciation http://www.ewtn.com/Devotionals/Novena/annovena.htm

is good to remember that through Immaculate Mary at the moment of the Annunciation, Jesus entered the world in His human nature. Through Mary, He became a member of the human race. Through Mary, Jesus was given to the world for the salvation of mankind.
Through Mary, an Immaculate Virgin, Jesus received His human form to become the perfect sacrifice and sin offering according to the Divine will of God the Father. Through the atoning sacrifice of Jesus came an end to the imperfect sacrifices and sin .
Let us pray,
[That we may become more like Christ,
who chose to become one of us.]
Almighty Father of our Lord Jesus Christ,
You have revealed the beauty of your power
by exalting the lowly virgin of Nazareth
and making her the mother of our Savior.
May the prayers of this woman
bring Jesus to the waiting world
and fill the void of incompletion
with the presence of her child,
who lives and reigns with You and the Holy Spirit
one God forever and ever. Amen