To receive the Gift, one must be in the state of Sanctifying Grace. Consider praying an act of contrition before asking for the Gift. To receive the Gift, one must simply desire it. If you commit a venial sin, you will need to pray an act of contrition and ask again for the Gift. For mortal sin, you must go to confession first. The prevenient act is the prayer you say every day when you wake up to request that God's Divine Will operate in you.
You can download a pdf of the prevenient act here. Simply cut out the prevenient act, fold in two, and you can keep it inside your missal or prayerbook.
The following is an excerpt of the prevenient act you can pray right now to receive the Gift of Living in the Divine Will:
I am nothing, God is Everything; Father, I love you! Come, Divine Will, to think in my mind, to flow in my blood, to look through my eyes, to listen in my ears, to speak in my voice, to breathe in my breathing, to beat in my heart, to move in my movements, to suffer in my suffering, and may my soul, consumed and fused with Your Will, be the living crucifix immolated for the Glory of the Father.