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I find it's generally more like
Is it a case of take photo of wiring
Turn off electrics
Undo wires
Discover new light has different terminals to old light
Wire new lamp according to what you hope is right
Turn on electricsObviously I'd also turn off electrics before opening it up to take a photo.
In my experience it's sometimes easy, sometimes a sod with random wires, different terminals, a new fitting that doesn't line up, etc. Particularly so if it's an old property with a variety of bodges.
Also, if you're not able to test whether the electric is off I'd be tempted to turn the electrics off fully rather than assuming that all the lights are on the correctly marked switch at the consumer unit.
I want to replace the wall lights in the house.
Is it a case of take photo of wiring
Turn off electrics
Undo wires
Wire new lamp according to photo
Turn on electrics
I don’t have a volt pen or similar to check the electricity has deffo gone off - should I before attempting? There’s 10 to do so it would be a saving if I can do it myself