Unfortunately, I think you're underestimating the level of my ignorance.
I've looked at that before, and it's quite confusing. I have the jailbreak and launcher installed, so I know I can start usbnetworking, but as to how I effect changes or SSH into the device, it gives no indication. It gives instructions how to enable it, but assumes one knows what to do once it's been enabled, and of course I do not.