You will have to unplug the seatbelt pretensioner wiring, as well as the electric adjustment wires.
If you have a side airbag (they are inside the seat) you MUST, and I stress ABSOLUTELY MUST take the negative terminal off the battery, and DO NOT, whatever you do, turn the ignition on until everything is plugged back in & double checked.
The SIAB (side impact air bag) wiring has a yellow or orange plug near the rear of the runners - just like the motor's wiring plug.
If you don't disconnect the battery, it will throw up an airbag fault and the only way to correct it is to go to holden and have them clear it with a Tech2 (read: $$$).
It is always a good idea to disconnect the battery whenever you work on ANY electrical system of the vehicle.