Disassembling a Laptop system is far more complex than a typical desktop system as the laptops come in various sizes and shapes very unique to the manufacturer.
Laptops have more screws compared to the desktop and the disassembly often requires a user's manual or instructions to carry out.
Most of the chassis have plastic components that interlock and require specific instructions to open up.
Laptop systems vary in design and shapes which are unique to a particular vendor.
Laptops design varies from manufacturer to manufacturer, and even from model to model. For this reason, it really helps to have model specific documentation on disassembly / reassembly from the respective laptop manufacturer.
The figure shown on the right side of the screen displays an exploded view of DELL D600 Laptop. 
