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If you are hardwiring a new fixture, to be safe turn off the MAIN breaker first. Sometimes lights aren't wired to the room they say they are in the breaker box!
Satin and Brushed Nickel finishes are quite popular with interior decorators right now. For a complete updated look, think about switching out door handles and hardware to match the finish with lighting fixtures. You might want to think about coordinating plumbing fixtures in bathrooms, too.
If you decide to change the door hardware to match, Satin Stainless finish is very similar in appearance, you might not notice the difference unless you know look for it. I always recommend satin stainless door hardware, as it holds up better to corrosion.