Here's what your seat looks like under the plastic cover:
You'll need a couple of different size sockets, wrenches and a Torx for the seatbelt.
Hopefully, your problem will be on the door side and you can just pop the cover off and tighten things up. You may have to remove the entire seat to get at the side next to the center console. The seat is easy enough to remove: 3 bolts, 1 nut, and one large Torx bolt for the seatbelt. Move the seat all the way back to get at the front bolts, and move it all the way forward to accress the rear bolts. It's pretty light too, so it will be easy to move around.
Word of warning; when you have the seat completely unbolted, the mounting rails will move independently of each other. You won't be able to reinstall the seat if the rails are uneven.
Good luck, I can post more pics if you need them.