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One of those things where you have to live a little dangerously! Just how wide are you going though?
I've just replaced 4 this afternoon and every one of them went well. I should probably buy a lottery ticket.
When you think about it you know there are wires there, you can have a little feel of them when you take the old lamp off, see if they have a little slack (probably will) and just wiggle them about a bit to see if you can feel which way they are hanging.
Also remember that a wire that's loose will likely deflect from a drill bit (especially hammer) or screw tip. Once you've got the plug in there just use a sensible size screw, you should be alright. There's is very little way of knowing the routing of a wire or pipe, sometimes it's worse to make assumptions.
Always worth remembering the number of these jobs that go on every day. If hitting a wire was a regular thing we would be hearing a lot more about it.
About to change this ‘lovely’ lamp which requires a couple plasterboard fixings for a wider base. Ideally I would like to avoid hitting an electric cable do I need an stud finder (probably won’t use it again for years) or would a stud finder phone app or a powerful magnet do the trick? Could someone that knows about electrical installation tell me the most probable routing of these lights? The switch is down the wall that will come from the top left of the image, almost centred between the top right and top middle lights