Pray using the regular rosary. See chaplet of the fiat website)
Then, before every decade of the FIAT prayer:
HAIL, HOLY QUEEN, Mother of mercy, our life, our sweetness and our hope. To thee do we cry, poor banished children of Eve. To thee to we send up our sighs, mourning and weeping in this valley of tears. Turn, then, most gracious advocate, thine eyes of mercy toward us, and after this, our exile, show unto us the blessed fruit of thy womb, Jesus. O clement, O loving, O sweet Virgin Mary.
V. Pray for us, O holy Mother of God.
On each of the 10 beads:
BEHOLD THE HANDMAID OF THE LORD:
BE IT DONE UNTO ME ACCORDING TO THY WORD.
Recite on each of the five beads after the Crucifix
Remember, O most gracious Virgin Mary, that never was it known that anyone who fled to thy protection, implored thy help, or sought thine intercession was left unaided.
Inspired by this confidence, I fly unto thee, O Virgin of virgins, my mother; to thee do I come, before thee I stand, sinful and sorrowful. O Mother of the Word Incarnate, despise not my petitions, but in thy mercy hear and answer me.
Why pray the Fiat chaplet
The fiat of the Blessed Mother - because it is living the will of God, is the way of union with God. It is the way of the saints and the mystics of the church, the way of holiness. Because of Mary's fiat, her complete surrender to become the Mother of God, we were given the power to become children of God.
Thru the fiat the soul gives the Holy Spirit permission to take possession of it. The Holy Spirit can then dwell in us and God can use us in any way He desires. Since God desires only what is best for us it is fitting to give Him permission to reign over us and use us as His instruments. It is through our fiat that we become channels of grace to others, we become His victims, drawing souls to Him. The more our desire for union with Him grows the more we beg Him to purify us. We strive to do penance and to mortify ourselves so that we can become more useful instruments.
The fiat is the key to heaven. It is the way of surrender, of giving up ourselves to be lost in God, lost in God but truly found, because our true happiness is found only in living the will of God. Our Lady thru her fiat teaches us that it is the way of faithfulness, humility obedience and acceptance.
The mystical incarnation can only happen in us when we give our simple, humble, fiat. But when it is united to Mary's it has such power. It is going to Jesus thru Mary. Thru it we allow Him to be born in us. We are overshadowed with the Holy Spirit as Mary was. We give Him power over us. We allow ourselves to decrease so He can increase and it is then that He can manifest Himself in us so that when others see us they no longer see us but they see Him who dwells in us.
The fiat of the saints was so complete that He could work miracles thru them. They surrendered their intellect and they became doctors of the church. They gave Him their hands and He gave them the zeal to work tirelessly for His kingdom. They gave Him their voice and He filled them with the Holy Spirit and their words inflamed others. They surrendered their bodies and they became His martyrs.
Mary's fiat at the Incarnation began her spiritual motherhood. But it did not end there, there was more. At the foot of the cross she silently gives her final fiat, which was one of the greatest acts of love. It is beneath the cross that she accepts the motherhood of those who had just crucified Him, the motherhood of all of us. She is the greatest victim soul the world has ever known. She is our model who is always pointing the way to Him. Praying the Chaplet of the Fiat honors Mary by repeating her in her most profound response to the angel, "Behold the handmaid of the Lord, be it done unto me according to Thy word" Meditating on these words, taking them into our minds, transferring them to our hearts and then putting them into action, by allowing God to use us.
Jesus, give us the grace to honor and imitate her, the holiest of all Mothers in her holy surrender. Give us the grace to say with her, "Be it done unto me according the Thy word".