Repentance & Temptation

Piper refers to repentance as being an internal change of mind and heart. Can this internal change be the acknowledgement of one's sin, and realization that Jesus needs to be the one to do the changing? How does one change internally and undergo true repentance if s/he is still attached to the sin? Prayer? Change eternally first? Simply look to God? A mixture of some of that? Maybe a change of desire could be one method to encouraging/leading to heart change. James 1:14 says, "But each person is tempted when he is lured and enticed by his own desire." So if those desires are transformed, perhaps the temptations will decrease as well. On another note, I wonder what exactly 'temptation' is...can it be possible to be tempted without any evil desire? Hebrews 4:15 talks about Jesus being "one who in every respect has been tempted as we are, yet without sin." So he was tempted...and even suffered. Hebrews 2:18 says, "he himself has suffered when tempted"... but does that word have a different meaning than it does in James 1:13, when it says, "...God cannot be tempted with evil..."? Maybe in the latter case it means there is no way God would give into the temptation...or maybe it means that He is finished with personally experiencing temptation?