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Cut away the excess paper and then undo the socket and feed it through the hole that you have just made. Brush the paper to the wall and then re fix the socket.
At the top you can now fold the paper back on itself to give you a paste line, you can clearly see this line and cut it using a sharp pair of scissors. Then brush the paper back to the wall and if necessary brush on a little more paste.
Fold and trim the bottom of the paper and then brush this back against the wall, applying more paste if necessary.