So this is the first time I've ever actually messed up my phone.
Clockwork wouldn't go into recovery, so I tried to flash SP from Rom Manager, but it kept saying there was an error.
After trying that a few times, uninstalling RM, etc., I decided to flash SP with RSD Lite. Now my phone is stuck in a boot loop, the LED is red, phone tells me to connect my charger, etc.
I tried to flash a second time using RSD, but that didn't help.
When I started the phone was 80-90% battery.
Edit: Problem fixed by putting the rom on the SD card through SP Recovery and flashing