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The first step when replacing a video card in a laptop should be to find a service manual with correct disassembly procedures. This is important because laptops can vary significantly in their design and component layout, making it critical to understand the specific steps needed to safely and effectively access the internal components.

A service manual provides detailed information on how to properly disassemble the laptop, including which screws to remove, specific tools needed, and any special precautions to take to avoid damaging sensitive components. Following the manufacturer's guidelines helps prevent mistakes that could lead to physical damage to the laptop or its components, as well as potential safety hazards.

While disconnecting the battery is certainly an important safety measure, it should be done as part of the procedures outlined in the service manual rather than as an isolated first step. Removing the existing video card and saving documents are steps that follow after securing the proper disassembly instructions and ensuring that the device is powered down and safe to work on.