By the way, if you've got a DH to Osaka sometime, try using NW to NRT, and then catch the ANA flight that leaves 2 hours later and goes to the Osaka Itami airport.
Twice now I've taken the bullet train NRT-KIX. You buy the ticket for the whole trip at the JR ticket counter in the basement of NRT terminal. Then it's the local JR line to Tokyo downtown station, switch to the Shinkansen line there. ~170 mph I think, all down the east coast. The high-speed part takes about 4 hours to Shin-Osaka. Then get on the subway to Namba.
Not the fastest commute in the world, but one of the coolest. I brought a book but didn't even open it - I just stared out the window.
By the way, the NRT station was very helpful and has a handout with step by step details on this. Just email them and KIX in advance. And you need a mid-trip deviation - the money for first class is about the same as ANA.