On a side note, great job on the song.
Reamping is a fairly new concept to me, but I've done it a few times with moderate success. You need an interface device, the ASIO drivers for it, a DAW, an amp sim, and a VST that loads cabinet impulses.
First you record your dry guitar sound through the interface to your DAW. Open up your amp sim in the effects loop and choose a head that fits your taste and then bypass the cabinet. Load the impulse host VST and load the impulse of the cabinet you'd like to use. That's all there is to it.
Make sure that the impulse host is set to 100% wet in the VST or it will sound wrong. I use keFIR Impulse Loader. Here's a video with the link to the VST and some impulses in the description.
http://www.youtube.com/watch?v=A0nVsmoiEUk You can find several free impulses all over the web, just google them.
Hope all this helps. Good luck.