I think it's something I'd like to try myself. I'm talking like a release of 200 or 300. Thanks for the suggestion though. I'll bookmark those pages for future reference.
Could a fried motor still play/record well like mine? Or is it a separate mechanism that fast forwards/rewinds?

Hmmmm... it could be that the motor is fried.

If you want to do a cassette release, there's a lot better options than dubbing them all yourself. Check out http://www.atozaudio.com/ or http://www.duplication.ca. Both have pretty good rates.

I found a Marantz SD800 for ten bucks at a thrift store, and it's in great condition. It plays well (best quality I've heard out of cassettes, too), and it records surprisingly well. It took me a while to figure out how to record, even though all you do is hold both the play button and the record button. Anyways, I can't figure out how to use the fast forward and rewind buttons. Nothing happens when I hold the buttons. It makes the same sound as playing at first but then nothing moves or anything. Do I need to repair anything? Sorry this is so long. My band is thinking of doing a limited cassette run for our debut release. Thanks in advance!

tl;dr How do I fast forward/rewind on a Marantz SD800 deck? Thanks!