The only domestic to domestic leg that I took was on the return, Kunming to Shanghai. The other 3 legs were international. I also picked up my luggage in Kunming, since it was an overnight stopover. Like I said, on the return, I followed the crowd and after a long walk saw most of them heading towards Terminal 2. I took the escalator up and ending up in the Departures check in area. I honestly didn't see very many signs and when I asked someone directions, it was usually someone working at an unrelated job at the airport. Not like Narita, where there is an airline employee usually just before the transfer line, waiting to look at your ticket.