Turn the power off and make sure it is off.
Strip back the cable so you can see the internal coloured sleeving.
Get the earth sleeving that you will need.
Leave yourself enough length of the blue brown and Earth wires.
Two blue to neutral. Two brown to live. Sleeve the two earth wires with the sleeving.
Put the two earth wires in the earth terminal.
A proper electrician will then do a continuity test of the ring final at the consumer unit before reconnecting the power.
Should perhaps also be mentioned that an earth core should run to the metal back box and, if the chosen socket faceplate is metal and it has a separate/dedicated earth connection for the face, that should be linked up to earth too
Other detail I think would help:
Make sure the power is off. If it’s not, attempting fitting this socket could be the last thing you ever do
Prior to doing any work, use a multimeter at the fuusebox end to prove good continuity on all cores - pull the browns out of their MCB, put the meter in resistance mode (ohms, omega symbol, 200 probably) and check you get a low reading. Repeats for blues and earths. If the meter remains showing 1. or OL, you have a wiring fault that should be resolved before continuing
Cut the wire at the bend
Cut down the wire a short way with your cutters, so it ends up splayed like a Y
Grab the earth (the gold one) with your pliers and pull it gently in one direction while pulling the grey sheath in the other direction. The core will pull through the side of the grey
Keep going til you get to about 1cm away from where the wire comes into the box
Separate all the cores from the grey sheath and clip the sheath off and bin it
Repeat with the other
Offer the socket up to the hole and touch the bottom of it to the wall, and flip it down so you can see the back. Note where the holes are for L, N and E and measure how much wire you’ll need to comfortably reach them while giving some slack to allow you to bend wires around and out of each others’ way, but not so long you’re trying to cram a foot of wire into the back box.
Cut all wires to length, bearing in mind you need about a 1cm to put into the holes on the back of the socket
Fit the Earth sleeve to the two gold cores measure such that you have about 1cm of core sticking out when the Earth sleeve is in place. Turn the end of the core over and back on itself like an umbrella handle/fish hook and squash it flatter(don’t obliterate it) with pliers
When you skin and fit the blue and brown you should not have any copper core showing out the back of the socket hole. The inner core should be snipped to length to allow the sheath to go a couple mm past the hole entrance
Ensure that the screw is clamping copper, not the sheath (don’t cut the copper stick-out too short)
Pull hard on the wires. If they fall out, do it again, better
You’ll likely have a bit of copper wire hanging around that you can use to connect the back box (little gold terminal in the lower left) to earth
When time comes to fit the socket face, route the wires so they don’t pile up on top of each other and aren’t a crammed in dogs dinner
Particularly ensure that no wire is jammed behind the screw holes for the screws that hold the socket face on. You don’t want to wind the screws in, straight through the love core and create a fault
When you fit the face, get both screws started before tightening them. Hold the face of the socket firmly against the wall and wind the screw up. If it goes tight or feels of check you aren’t hitting a wire or the back box. If the screws are too long you can clip them down with snips, then tickle them with a grinder to resolve damage to the threads that will make it hard to start them
Don’t over tighten the screws; you need just enough pressure to stop the socket face sliding round the wall, without ruining the face or the plasterboard
Do the same check with the multimeter
Wait until he finishes the job.
Maybe, or maybe there is a reason he won’t be back. This isn’t work that must be carried out by a spark; it’s acceptable to DIY
