The four key components to proper disassembly of a laptop are :
- Document and label cable and screw locations 
 - Use appropriate hand tools
 - Organize parts 
 - Refer to the manufacturer resources
 
Step-by-step explanation:
- Tools like Phillips screwdrivers, Torx screwdrivers, Screwdriver magnetizer, Case opening tools, Tweezers, Screw container and organizer, Digital Multimeter should be kept handy.
 - While disassembling a laptop you should organize it's parts properly and neatly.
 - Every laptop comes with a resource manufacturer. Refer to them for the proper handling of specific tasks.
 - A computer does contain precious metals, but it also contains toxic elements such as mercury, lead, and beryllium. 
 - Disposal- When you disassemble a computer, you may have to make a few trips to a few different companies to sell all of the material.