Well I don't know if my timing was off before because of how slow the phone was when I tried to get it into DFU or what, but I was finally able to get in there, and I restored the phone. I'm re-syncing it now, but it won't reinstall my apps because it says I'm not authorized or something...
I'm putting all my music back on it now, and I'll probably be able to figure out how to get the apps back on there too. What I'm really waiting to see is if it'll be able to reconnect to wi-fi networks again. That was another thing it wasn't doing after the jailbreak. It was saying it was connected in my settings, but there was no icon next to where my service provider would be at the top of the screen, and it wasn't loading pages or updating stuff in the Facebook app and things like that.
Perhaps my problems are solved... We'll see I guess. I think in the future I'll refrain from trying to jailbreak it right after an OS update comes out. Especially since I'm not quite as computer-literate as I'd like to think. Once I get some cashflow goin' I'll probably get AT&T service again and get a newer phone that I won't need to jailbreak in order to get backgrounding and a battery percentage indicator.