I started a little training yesterday by familiarizing him with the clicker (purchased at PetSmart for $1.50) and treat system. I have ordered two books on the subject and will try some other training today.
Right now to keep him away from the tree I am distracting him with extra play time. I have got all his favorite mice out from under the couch for him to play by himself and have played with his other favorite toys. We will see how the day goes.