"I don't actually know all that much. I, ah, didn't really get the formal training." Harry covers his wince, but this is why he didn't mention it earlier. He was worried that people will think he's some sort of magical prodigy when he's really, truly not. "I'd been doing a bit of fieldwork mixed with practice, but with the state of things, there really hadn't been any time or anyone to teach."

He's all very matter of fact about it, because as far as he knows, that's just the way it is, but it's not normal. It's certainly ill-advised to fling teenagers out into the field without support.