You have the freedom to make a decision to jump off a 100 story building. but once you are in mid air you can not change your will. The outcome of our wills are dependent on circumstances and natural forces. You can not "will" and A from your favorite teacher....well you can will it,but his will overrides yours.
So although we talk about free will in reality our wills are very constrained.Our wills are influenced by circumstances and events. God has given man the will to do what he wills to do.But I do not know that one can will something that God does not want.