Fundamentalists are generally unwilling to exam the implications of the implications of Jesus' full humanity. The human Jesus is limited in knowledge (e. g. Mark 13:32), power (Mark 6:5--"He could do not deeds of power there..."), and wisdom (Luke 2:52--"Jesus grew in wisdom..."). Paul sums up all Jesus' limitations by teaching, "He emptied Himself" to become fully human (Phil. 2:7). Emptied Himself of what? His divinity? No, He emptied Himself of His divine prerogatives. Indeed, Jesus had to do this in order to be "tested in every way just as we are (Heb. 4:15)."
But this self-emptying implies even more limitations. Jesus had not always been obedient; rather, He had to learn "to be obedient through the things He suffered (Heb. 5:8)." Therefore, Jesus only gradually "grew in favor...with God (Luke 2:52)." So His prayers were heard not because He was the Son of God, but because of His "godly reverence (Heb. 5:7)." So it should come as no surprise that Jesus felt the need to accept John's baptism of repentance, a fact that is not undermined by John's protest (Matt. 3:14-15). So Jesus had to learn by trial and error just like the rest of us.
This is clearly implied by Luke 2:41-52. Jesus (age 12) leaves His family entourage on their return journey from Jerusalem to Nazareth without telling His parents. This lack of considerateness makes His parents worried sick and forces them to launch a distraught 3-day search to track Him down. Finally, they locate Him in the Temple. Jesus is rightly rebuked by a distraught Mary: "Child, why have you treated us like this? Look, your father and I have been searching for you with great anxiety (2:48)." Clearly, Jesus should have told His parents where He was going! Luke rightly reacts to this mistake by musing, "Jesus grew in wisdom... and favor with God...(2:52).
To retain the doctrine of Christ's sinlessness we need to distinguish sin from the human necessity of maturation through a process of learning by trial and error.