Power Window (PLEASE HELP)

I have a '00 Elantra and I think my drive side power window regulator is going bad.

I bought a new regulator and already took apart my door panel. The only problem is I have no idea how the original regulator comes off. Right now the window is all the way in the up position. I removed a total of 8 nuts but the old regulator won't budge. Am I missing a step?

Please help!