If Harry Defeats Voldemort, how will he finish him off?

Question:

If Harry Defeats Voldemort, how will he finish him off?

I know some think he will sacrafice himself to save everyone. I personally don't see how that will finish off Voldemort. I don't think he is a horcrux, I trust Dumbledore when he said his thoughts on Voldemort's horcruxes. So will he use the killing curse? Ok, 2 questions I guess. Since they both have brother wands, it only has the Priori Incantatem effect if they say a spell at the same time? I think Voldemort used a crucio curse on Harry.

Additional Details

4 days ago
After he has destroyed the horcruxes, all hypothetical.

Best Answer - Chosen by Asker: 4 days ago
After he has destroyed the horcruxes, all hypothetical.