On a Roadster, you are likely to remove the carpet for one of two reasons: either to install cabling, or to dry it out!
Start by disconnecting the battery. This is very important if you have seats with integral airbags. Failure to do this will lead to an airbag warning
light on your dash. It is good practice to do this anyway, even if your car has standard seats.
Use a T45 Torx bit to loosen the front bolts securing the seat runners to the floor.