You simply need to select a location for the equipment, whether viewable or hidden, that has AC power and where you can fish the A/V cables through the wall back up to the television.

You then install an IR repeater, or also sometimes called an extender, which consists of an IR receiver, small interface box, power supply, and IR emitters.

The IR receiver is typically placed discretely near, or just behind, the television and the emitters are placed in front of the equipment. The interface box/power supply are also connected at the equipment end.

The wiring for the IR receiver is fished along the same path as the A/V cables.

Now when watching television, and you inherently point the remote at the television to change channels, the IR signal is transmitted over the wiring, through the interface box, and to the emitters, and you have full control of your cable box, DVD player, etc.

Neat, clean, and sweet!