The distribution box has a bunch of wires coming out of it with a small IR blaster on the end thats sticky. You put the blaster right on the component IR receiver eye. 6 blasters are included and Hot-Link has a kit to hook up a second batch of 6 to the same distribution box. Its very easy to set up, especially if you're only going through 1 wall. At the TV side, I used a couple bits of black electrical tape to keep everything hidden nicely.
The only possible complicating factor is if you have a device where the IR eye is hard to find. It took a bit of trial and error to get it positioned on my Onkyo receiver. I just cut a hole in a piece of card and moved it around with the blaster against the hole with my wife in the other room using the remote. As soon as it worked for her I knew I had the correct position.
Also, if you have any problems, Hot-Link customer support is excellent. Just give them a call and they'll help you out.