Alan F's response reminds me of someone we call in Texas "All hat and no cattle." You can thump your chest all you want and say "Whatta deal Jesus had! Of course I'd do it. What's a measly impaling on a cross in comparison to being King of the Universe?" You'd fill your pants and run like a chicken if you were offered the same deal. I'd probably be right there with you too.
I don't know how much Jesus knew or what his faith was, or what perfection feels like. I do know that eyewitnesses record he was "in an agony," "sweat like drops of blood," that he asked God not to put him through it. In other words, it seems to indicate he was terribly afraid. How much did he remember of his previous life in heaven? Maybe nothing except he knew he had lived before by scripture. I don't know. So how much faith is that? I do know the experience he was going to undergo was completely new to him, that he was going to suffer to a degree he had never undergone before. The Bible indicates his endurance, by whatever measurable degree that was, perfect or not, was pushed to the absolute wall. He cried out, "My God, my God. Why have you forsaken me?" That doesn't sound like someone in perfect control to me, but rather someone who has reached his breaking point.
What is moving to me personally is the fact that if Jesus was who he said he was (something I'm still studying) that he was a powerful spiritual superbeing that was the son of God, that he was willing to undergo the experience at all. Why not destroy the imperfect part or parts of the universe and start over? I don't see anything trivial about choosing to undergo his human experience, no matter what the "reward" was. He already had his position in heaven. He didn't gain anything as far as a heavenly "promotion" by choosing to die for the world. He was going to return to the "glory he had before the world was." No bump in status that I can see. So what was he coming here for? That's the part that moves me.