According to Biblical Unitarians, Did Jesus know that he would succeed?

Biblical Unitarians believe that Jesus was only a man and that he was given the gift of the holy spirit at his baptism in order to help him resist sinning and complete the purpose for which God the Father sent him. As near as I can understand BU believe that Jesus had his own will which was sometimes different and even at odds with the will of God (for example, "nevertheless not my will but your will be done"). I think BU would agree that God knew beforehand that Jesus would succeed as evidenced by the large quantity of prophecies given to that effect. Here are just a couple of examples: > Behold, my servant shall act wisely; he shall be high and lifted up, and shall be exalted. As many were astonished at you— his appearance was so marred, beyond human semblance, and his form beyond that of the children of mankind— so shall he sprinkle many nations. Kings shall shut their mouths because of him, for that which has not been told them they see, and that which they have not heard they understand.- Isaiah 52:13-15 > Yet it was the will of the LORD to crush him; he has put him to grief; when his soul makes an offering for guilt, he shall see his offspring; he shall prolong his days; the will of the LORD shall prosper in his hand. Out of the anguish of his soul he shall see and be satisfied; by his knowledge shall the righteous one, my servant, make many to be accounted righteous, and he shall bear their iniquities. - Isaiah 53:10-11 Jesus knew the Scriptures very, very well (to say the least) and he both knew what they said about God's Messiah and also that he was that very Messiah: > And the scroll of the prophet Isaiah was given to him. He unrolled the scroll and found the place where it was written, “The Spirit of the Lord is upon me, because he has anointed me to proclaim good news to the poor. He has sent me to proclaim liberty to the captives and recovering of sight to the blind, to set at liberty those who are oppressed, to proclaim the year of the Lord's favor.”  And he rolled up the scroll and gave it back to the attendant and sat down. And the eyes of all in the synagogue were fixed on him. And he began to say to them, “Today this Scripture has been fulfilled in your hearing.” - Luke 4:17-21 He knew ahead of time that he would be handed over to the Gentiles by the Jews, mistreated, killed, and rise from the dead: > for he was teaching his disciples, saying to them, “The Son of Man is going to be delivered into the hands of men, and they will kill him. And when he is killed, after three days he will rise.” - Mark 9:31 In keeping with all of the Levitical prescriptions for sacrifices, the resurrection of Jesus from the dead is proof that he was successful in offering himself as a sacrifice without any spot or blemish of sin: > Great indeed, we confess, is the mystery of godliness: He was manifested in the flesh, vindicated by the Spirit, seen by angels, proclaimed among the nations, believed on in the world, taken up in glory. - 1 Timothy 3:16 I have seen BU content stating that Jesus, since he had a merely human will and was tempted in every way like we are, certainly could have sinned. Given that Jesus knew he would justify many by rising from the dead and that this resurrection on our behalf required his death in a sinless condition: 1) Do Biblical Unitarians agree that Jesus must have known ahead of time that he would live a sinless life? 2) If yes, in what sense can it be said that Jesus "could have" sinned?