The Will of God is one divine will that was, is and will be complete and the same forever --- God does not change his mind about what was intended before the beginning. The "will" might be viewed as two categories: predestined will and cooperative will. The latter, cooperative will, involves the application of individual free will to participate in the overall decree of God's divine plan.
Predestined Will is a universal event which MUST come to pass in God's time regardless of which individuals are involved in its development. Examples would be:
The establishment of "a chosen people" as offspring of devoted and loyal servant, e.g. Abram. It did not have to be Abraham but, due to his continued love, acknowledgment, reverence and firm faith in the One God, he fulfilled the assigned mission.
The leading of a "rebellious people" through the ages in spite of their waywardness because it was from this stock that the Messiah was to come. Persevering men who, even though sometimes protesting, cooperated with God's Message by submitting to the Divine Will: e.g., Isaac, Jacob, Moses, etc. If they had rejected their call others would have carried the banner.
The selection of the Virgin Mary to be the vessel by which the Messiah entered the human state. Technically, Mary could have withheld her consent and another would have given their consent. God did not force his will upon her -- it was cooperative will between God and human.
The human nature of Jesus, in theory, could have scampered away in the night and avoided his ultimate fate. Indeed, satan did tempt him for 40 days after his baptism by John and it could have been at that point the will of Jesus and the will of the Father became totally one. It was necessary for the man Jesus to experience the fight with temptation of ALL sin in order that he would be fully able to take the sin of all mankind upon himself --- the savior of the world.
Cooperative Will is the development of human will to be in accord with the will of God. This process can take a lifetime; certainly it is not likely to occur in only one or two decades. Although endowed with the Divine Nature by the Holy Spirit, the human nature of Jesus had to experience and make decisions on all things that render a human worthy of eternal oneness with the Creator, God the Father. That could include all experiences that might lure an individual to become wholly and selfishly enmeshed in materiality to the point of loss of awareness of their Source. It could also include adversities that might cause an individual to forsake God for some reason just as happened on many occasions in the ancestors of the man Jesus when they turned to idolatry seeking worldly comfort. It all boils down to the thought:
If God does not give me what I want, there can be no God.
If God lets something happen that gives me pain, there can be no God.
Such thoughts are only of self and personal desires. We blame God for our distress.
The man Jesus needed to be honed not only into the likeness of God but blended into the Godhead itself to become the second person in the Holy Trinity --- The Divine Atonement of all humankind, the Word to show the way, the Light that brings security and peace. The man Jesus responded to that call to become the Messiah, the Christ, the giver of life.
In the end, the man Jesus died on the Cross. He had been betrayed by one of his own, Judas Iscariot, for a few coins. It did not have to be Judas Iscariot but his lust for money (and probably other matters) kept his will away from the will of God.