If you do not have a complete and thorough understanding of what it is that you are messing with then you DO NOT need to be messing with it. And this is to avoid someone from painful shock/muscular paralysis/extreme breathing difficulties or even death caused by the current passed directly through the heart. (Added by Mr. Domingo S. Amancio, ALS Mobile Teacher, Dalaguete, Cebu, Phillipines)
The most important rule for health and safety at work is "Be aware and alert."
Wear safety googles
Safety Goggles
wear helmet
The most important rule for laboratory safety is "Know the hazards of what you are working with." The next most important rule is "Know how to protect yourself from the hazards of the materials you are working with."
"Know the hazards of what you are working with."
Treat all weapons as if they are loaded.
Wash your hands
make sure you have on protective gear
know the hazards of what you are working with.
Always know what your doing... never try something on your own,
Listen to your teacher or administrator's instructions very closely