how do I replace the front seat cushion on the driver side and leather bottom

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I am trying to replace the driver side seat cushion on a 2007 DTS with heat and air conditioning seats and I need to replace the cover on the bottom anybody have any answers on how to do this do I need to disconnect the battery or can I just on both the sea and disconnect electrical for the air conditioner and lumbar support and replace the cushion and the leather seat bottom