Different methods. Expelliarmus was quite useful more than one times.
The movie in which Harry Potter sees Voldemort in a mirror as himself is Harry Potter and the Order of the Phoenix. :)
In the end of the 7th book, Harry did not defend himself because that was the point. By dying sacrificially and without opposition, he would protect all the people fighting for him. Also, Harry knows that there is no protection against the killing curse, spell-wise.
No, Harry beats Voldemort by himself.
Harry's one of Voldemort's horcruxes. On the night of Halloween, when Voldemort killed Lily and James, he made Harry a horcrux. Voldemort himself didn't know this fact that time. This is the reason Harry can speak parseltongue.
Voldemort's own spell kills himself.
Harry's mother wouldn't let voldemort kill harry and protected harry as much as she could until voldemort killed her. When voldemort finally tried to kill harry potter he was already protected through the power of love so the most damage voldemort could do was giving harry the thunderbolt shaped scar along with part of himself. When voldemort accidentally gave harry part of himself it drained his power leaving voldemort to vanish until he could regain his strength.
Voldemort kills Harry And Then He practicly kills himself
Harry finds another horcrux in Hogwarts and they destroy it. Then Harry finds out he needs to be killed himself in order to have Voldemort killed. Voldemort kills Harry, Neville kills Nagini, Voldemort's snake, and then Voldemort dies.
because the Elder wand can be forced to kill its owner like another wand could be forced to kill its owner. but voldemort did not kill harry with the wand he just killed a part of his own soul because harry didnt try to defend himself.
He decides to let Voldemort kill him, but all Voldemort did was kill a part of himself. Neville killed Nagini and Harry killed Voldemort with Expelliarmus
Harry indeed was a horcrux. When Voldemort attempted to kill Harry, and Harry was ready to die for his friends, Voldemort actually only destroyed the piece of himself inside Harry. Therefore, Harry survived, and he used the Disarming charm to kill Voldemort.Hope that answers your question!Note: Actually, it was Voldemort, who killed himself: his Avada Kedavra curse fall back on him.
He himself is not a book; Lord Voldemort is a character in a series of books titled "Harry Potter." He is the antagonist trying to kill Harry.