Well, the steps are in a slightly different order, but it's almost the same. The only thing it suggests doing differently seems to be under "Network Port Configurations", it says to drag the "FireWire" configuration (or whatever you called it) to the top as they're used in the order they're listed there. But you probably figured that anyway.
Hope you managed to get it sorted. It should be fairly straightforward as long as both ports are configured and you've enabled internet sharing, which your network status said you have. Don't know what else to suggest - I'm fairly new to this, hence the book! It managed to walk me pretty quickly through file sharing with Windows, so I reckon it can walk me through anything...
