Well I screwed up and missed the step that said "For Windows, hold the shift key and then hit the restore button. In the dialog box that pops up, browse the downloaded custom firmware file."
So it downloaded it's own new firmware and restored and now it won't let me restore to the custom firmware to use T-Mobile. I held the buttons down again and got it back into recovery but holding shift key never lets me select custom firmware. Am I screwed?