I just got done doing this over the weekend for my sides. We were able to pop-out the pre-existing moulding, run the wire in (there was actually a gap between ceiling and wall sheet-rock that we were able to snug the wire into) and then we just nail-gunned the moulding back up. As long as you hold the moulding up snug to the ceiling, you can do a horizontal nail in (so you don't risk shooting a nail through the wire). For the rears, we went up into the ceiling, across the room and down, so we only had to run them behind the moulding for a short bit. It's definitely a work-in-progress right now. If I can, will try to post pictures to my gallery (still in the process of renovation and move-in on a 50-year-old house, so it may be a little while).
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