Wrapping is certainly possible but doesn't look so good. However, shortening is really easy, you just pull the cable to the desired length, cut it and connect it. The connection itself is done with a clamp that can be released with a screw, which is pretty self-explanatory when you look at it. Then strip the cable (can be practised on the cut pieces) and push it back in as before and tighten it. The whole thing is also excellently covered, so it can also look bad in the housing.