Disassembly safety
Before you start a disassembly, there are some things you should know.
Eye damage. There is a risk of damage to your eyes due to small pieces of metal or plastic breaking loose -- releasing due to force stored during manufacturing, or structural stress. Solution: protect your eyes. Eyeglasses will help; safety goggles (sparts or industrial) are better.
Static discharge. There is a risk of damage to the system if you touch electronic components. You might well not necessarily feel the discharge for it to do damage. The damage is not necessarily immediate, the system can fail some months later, or even not work reliably. The damage can be cumulative. Solution: Make sure you and the laptop are at the same potential before dismantling. Touch a hinge screw. Ideally, your work area should be conductive. Connection (through a current limiting resistor) to an earth ground is desirable, but optional. When returning to the workstation, touch the conductive mat (or the hinge screw) first.
Remove the main battery and the power cable before starting disassembly. There is low risk of electric shock, since low voltages are used inside the system. However, there is a risk of accidental shorting with tools or screws. There will remain a clock battery (a "coin cell") on the main circuit board, powering a small number of circuits.
Be careful with the motherboard. It's both delicate and costly. Avoid dropping metal objects on the motherboard. The components used are small enough that dropping a screwdriver on the board may knock off vital components. Many connections are so close together that a tiny metal chip, too small to easily notice, could create a short circuit which might simply make the motherboard not work, or damage it, when you reconnect power.