At long last! Note: If at all possible try to go to confession at least within the octave of your consecration (8 days before or after).
The Day of Consecration
"At the end of the three weeks", says St. Louis De Montfort, "they shall go to confession and to Communion, with the intention of giving themselves to Jesus Christ in the quality of slaves of love, by the hands of Mary. After Communion, which they should try to make according to the method given further on [See TD # 266], they should recite the formula of their consecration, which they will also find further on. They ought to write it, or have it written, unless they have a printed copy of it; and they should sign it the same day they have made it. it would be well also that on that day they should pay some tribute to Jesus Christ and our Blessed Lady, either as a penance for their past unfaithfulness to the vows of their Baptism or as a testimony of their dependence on the dominion of Jesus and Mary. This tribute ought to be according to the devotion and ability of everyone, such as a fast, a mortification2 an alms or a candle. if they had but a pin to give in homage, yet gave it with good heart, it would be enough for Jesus, who looks only at one's good will. Once a year at least, on the same day, they should renew the same consecration, observing the same practices during the three weeks. They might also once a month, or even once a day, renew all they have done, in these few words: 'I AM ALL THINE AND ALL I HAVE BELONGS TO THEE, O MY SWEET JESUS THROUGH MARY, THY HOLY MOTHER."
Consecration to Jesus Christ, the Incarnate Wisdom, through the Blessed Virgin Mary
O Eternal and incarnate Wisdom! 0 sweetest and most adorable Jesus! True God and true man, only Son of the Eternal Father, and of Mary, always virgin! I adore Thee profoundly in the bosom and splendors of Thy Father during eternity; and I adore Thee also in the virginal bosom of Mary, Thy most worthy Mother, in the time of Thine incarnation.
I give Thee thanks for that Thou hast annihilated Thyself, taking the form of a slave in order to rescue me from the cruel slavery of the devil. I praise and glorify Thee for that Thou hast been pleased to submit Thyself to Mary, Thy holy Mother, in all things, in order to make me Thy faithful slave through her. But, alas! Ungrateful and faithless as I have been, I have not kept the promises which I made so solemnly to Thee in my Baptism; I have not fulfilled my obligations; I do not deserve to be called Thy child, nor yet Thy slave; and as there is nothing in me which does not merit Thine anger and Thy repulse, I dare not come by myself before Thy most holy and august Majesty. It is on this account that I have recourse to the intercession of Thy most holy Mother, whom Thou hast given me for a mediatrix with Thee. It is through her that I hope to obtain of Thee contrition, the pardon of my sins, and the acquisition and preservation of wisdom.
Hail, then, 0 immaculate Mary, living tabernacle of the Divinity, where the Eternal Wisdom willed to be hidden and to be adored by angels and by men! Hail, 0 Queen of Heaven and earth, to whose empire everything is subject which is under God. Hail, 0 sure refuge of sinners, whose mercy fails no one. Hear the desires which I have of the Divine Wisdom; and for that end receive the vows and offerings which in my lowliness I present to thee.
I; (Name), a faithless sinner, renew and ratify today in thy hands the vows of my Baptism; I renounce forever Satan, his pomps and works; and I give myself entirely to Jesus Christ, the Incarnate Wisdom, to carry my cross after Him all the days of my life, and to be more faithful to Him than I have ever been before. In the presence of all the heavenly court I choose thee this day for my Mother and Mistress. I deliver and consecrate to thee, as thy slave, my body and soul, my goods, both interior and exterior, and even the value of all my good actions, past, present and future; leaving to thee the entire and full right of disposing of me, and all that belongs to me, without exception, according to thy good pleasure, for the greater glory of God in time and in eternity.
Receive, 0 benignant Virgin, this little offering of my slavery, in honor of, and in union with, that subjection which the Eternal Wisdom deigned to have to thy maternity; in homage to the power which both of you have over this poor sinner, and in thanksgiving for the privileges with which the Holy Trinity has favored thee. I declare that I wish henceforth, as thy true slave, to seek thy honor and to obey thee in all things.
O admirable Mother, present me to thy dear Son as His eternal slave, so that as He has redeemed me by thee, by thee He may receive me! 0 Mother of mercy, grant me the grace to obtain the true Wisdom of God; and for that end receive me among those whom thou lovest and teachest, whom thou leadest, nourishest and protectest as thy children and thy slaves.
0 faithful Virgin, make me in all things so perfect a disciple, imitator and slave of the Incarnate Wisdom, Jesus Christ thy Son, that I may attain, by thine intercession and by thine example, to the fullness of His age on earth and of His glory in Heaven. Amen.
Note: You may wish to begin to wear a scapular now as a sign of your consecration. It is Our Lady's "livery", her uniform so to speak.