i have a rule for anything over 12 Volts...
IF YOU CAN'T SEE IT! DONT FUCK WITH IT!!!
24 volts shorting out makes me jump enough, never mind 240
i'm too scared to press a 1.5volt electric shock pen...
HTFU you softcock.
Household electrics, about as simple as can be
As already said, Bunnings $10, home, power off, this is the one if your not sure 'digital camera out', power off at board, make sure you do it yourself, remove socket retaining screws, pull slightly out from wall and turn over, if your a real bonehead take photo of back of switch for future wiring schematic!, remove wires, open packet from Bunnings remove replacement switch, wire in exactly the same way, fix back to wall with retaining screws, go outside and turn power back on, inside and test. Hey Presto.
I gave up with sparkies and home electrics 10 12 years ago, unless you can get a mate who's a sparky to do it at a good price, DIY, pommies loveit!
When I got to Aus and bought my house, I was just too busy and needed 6 ceiling fans putting in before we moved in. Was gonna DIY but sister said it wasn't done in Aus and I should pay someone. Hmmmmmm. OK. Got her recomended sparky in and 8 hrs later fans were fitted about $400!
3 years later one packed up so I had the time and I thought I would change it, when I went to take it down and replace I was amazed, the bodgy prick, instead of snipping excess wire to the right length he had just coiled it around the fan shaft, about 400mm, the cable had heated and bare live wires had strarted to come through. Checked all the others and ,YEP the same!
Not only could this have caught fire, ceiling and roof space, but could have electrocuted one of us!
So my time of paying electricians in Aus was over because of one bodgy tradesman.
If your sensible and do your homework, you can do as good a job if not better than a white pages sparky. Just follow the guidlines.
ps I take no responsibility if you proceed to do a job and your house burns down

Watch This Space.......I Told You Didn't I?
Officially Honoury Member NWSHCIAVANEWFARKINBIKE 2009.
Team Crash 2010 Ooooops