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The worst thing you can do is to run your fingers along the silicon to get a clean line, it will come back to bite you. I bought a kit of silicon finishing tools. It's pretty cheap and after a little practice you can get great results. Also you get a consistent finish.

For the first pic. I would get a couple of lengths of 2x1 batten. Cut them an inch either side of the length of the hole and fix them in position with gyproc screws. Then cut out a bit of plasterboard the size of the hole and fix to the battens. Second pic. Loosen the socket, isolate the...