How do you use a conduction tester?

Could you please elaborate on how one would utilize a conduction tester? Specifically, what steps does one need to follow in order to accurately assess the electrical conductivity of a given material or component? Additionally, what safety precautions should be taken while operating the tester to ensure both personal safety and the integrity of the equipment? Lastly, are there any common mistakes that individuals tend to make when using a conduction tester, and how can these be avoided?