Great Thread idea, thanks horusfalcon. Great discussion area also.
One point I was taught when studying Electronics and Computer Engineering / Workshop: when working on a "Live" circuit, which is one of the more Dynamic of situations, have one hand in your pocket.
Our Supply in Australia is 240V AC, 50Hz.
6 milliamps (0.006 Amps) across your Heart can Kill you.
The idea is; if right handed put your left hand in your left pocket, work with your right hand. The current if you do hit it will be re-directed down your left leg to ground, rather than across your chest, and Heart.
This is for a workbench situation, like working on a Live Circuit, i.e. Computer, T.V.
Yup, I'm left-handed, but I still tend to keep my left hand in my pocket when the gear's hot. That current is going to find the shortest path to ground, and you don't want that being across your heart.
There are generally a lot of "missed opportunities" in electrical and electronics tasks where folks will work hot because they don't stop to think about the work (which is one reason why a work plan of some kind is important - it should include the "path to safety" for the work). Work hot only when you absolutely have to
(yeah, I'll keep repeating that every so often - it's worth it.). Any other time, kill the power, ground the system, and bleed down stored energy sources.
Yeah! I'm glad to see participation here - the more the merrier (and, hopefully, the safer we all work)!