Quote:
Originally Posted by CallMeVilla
Look, I don't want to get into a "neener-neener" here about electrical safety. However, my guess is your Master Electrician has worked on live circuits many times -- as have I. Careful use of a circuit tester confirms the presence of line energy.
But ask yourself: If the light is NOT illuminated and the cicuit tester indicates NO line energy then why do you also have to trip the breaker way out by the garage (or basement) -- unless you are charging by the hour?
On a daily basis, I change out fixtures, receptacles, dimmers, and timers. I am careful to test the lines and WHEN IN DOUBT I trip the breaker. Otherwise, I use my brain.
All that said, for an amateur, it is probably best to trip it. Assuming he can find it! 
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Because you don't know who wired the house prior to you opening it up. What if there is a hot ground or neutral. Like Britknee said, it could be wired in reverse.
The people on this forum asking questions are NOT professionals. We need to advocate safety. I am not telling you to wear a hard hat and glasses like OSHA requires, but please advocate safety. Telling people who know nothing about electricity to work with hot wires is a liability.
Accidents happen and we're trying to advise people to avoid them.