It's not hard - it just requires patience. You know how you can braid short hair and it doesn't take long, but someone with really long hair needs more time to get their hair braided correctly? It's like that.

[ He looks around them, deciding that the place is relatively clean and it's not like he's trying to leave early. He really is trying to wait the training out to make sure there's no shinki he needs to escort back to Yona's temple. So he turns back to Nanako. ]

Would you like me to show you a little bit now and we can practice more another day?