How's Harry going to learn the curses?

[spang_b at yahoo.co.in]

No: HPFGUIDX 87183

Hi,
  There's been a lot of speculation about how Harry is going to kill 
Voldemort. That may be a long way off, but as the second war begins, 
Harry will surely have to kill some people... Bellatrix for instance. 
I imagine that he will kill her in the next book. And  may be 
Peter .He also needs use other unforgivable curses. With his feeble 
attempt at cruciatus curse not that effective, he needs to practise 
them more, doesn't he? I don't think they will be taught anywhere 
near Hogwarts and Dumbledore is only for teaching defense and not 
offense. So how's Harry going to learn them?
Bye
Adi