I did my own, but I had access from the side of the room to the ceiling joist, so I just fed the power in that way. I put the cables in a conduit, for easier management. I did it years ago, back when I needed HDMI, Component, S-video and composite, so i have lots of cables! I'm actually going to run a new HDMI today, which hopefully wont' be to hard with the conduit in place.
It all depends on access for how hard to do and how much it will cost..
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