Alternately, if it is wallboard of some nature (as opposed to plaster), repairing holes is really quite easy. Cut your hole cleanly, keep the cutout, get a couple of thin pieces of wood (shims, singles, etc.) and put them through the hole into the wall and screw them to the inside of the wallboard. Then put the cutout back in the hole, screw it to the wood you just put in, spackle, and paint.
I just had a look in the Reader's Digest Complete DIY Manual, and that's essentially what it says to do: make small square holes (about 4in square) wherever your cable route crosses timber, exposing the noggin or stud, then chisel a groove through the timber. Thread the cable and then patch up the holes -- which, as they're all at noggins or studs, won't require any extra noggins.
Peter
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