You need to take the entire trunk insert with the seat off, which is no big deal. 6 screws, nuts and bolts
- 2 chromed acorn nuts when you open the seat where the seat locking mechanism is
- 2 bolts in the front on the bottom of the trunk insert
- 2 small screws under the mat (you need to lift/remove) you take off to release the lower front plastic fascia of the trunk
Now you can lift the entire seat and trunk assembly out, but you need to disconnect the trunk light and power outlet electrical plugs.
I would recommend you find yourself the PDF workshop manual online, that will be of great help to you in the future.