I gave up at about 1am last night, but I found some good links explaining the process better. The last link I found said that the sd card can't be mounted as a drive on the computer while you're doing the command prompt stuff, and when I was trying it it was. So tonight I'll try it without the drive mounted and see if I have better luck. My phone is working, and it's got stuff on it it didn't have before, so I don't really know at what point I left off. We'll see! Thanks man.
did it work?