You only need to remove the seat cushion, not the back cushion. I sat down, hovered, and pulled straight up. Once one side is off, the other is a lot easier.

Here's a picture taken by Finagle to give you an idea of where the plug is:

 

Did you ground underneath the seat somewhere? I'm going to do an amp install someday..

 

I drilled a hole and ground in the trunk.

 

I got it thanks a bunch.
And for the ground, I've heard there is one bolt nearby when the carpet is exposed to reach the amp.

 

Hmm...i was thinking self-tapping screw.

 

It would be the same thing. There's still a new hole made with a self-tapping screw and the ground will still be held down by a screw.