Sorry, I meant to say the problem exists between steps 6 & 7: I select to transfer the data wirelessly between the two Macs (look for a Mac on my network) and it prints a code key to the screen.
But at this point, the little timer wheel spins round and round, but never says it has found another Mac on the network, so it just fails.
Both Macs (13" and 15") work happily on the wireless network and we can see each other in our respective Finder windows on the far left side.
Unfortunately, the only Firewire cable I have is for connecting a Mac to our Lacie backup drive. I don't have one that will connect between two devices.