If you're not inclined to hire a professional and are fairly handy, you can make the installation of a buried fence system a weekend project.
There are several brands of buried containment systems on the market today, most of which are made up of three key components: a transmitter, low-voltage wiring along which the transmitter sends a signal, and a battery-operated receiver collar for each dog using the system. Because the wires will be buried, it is important to first call 811 to ensure your installation layout will not interfere with any utility cables. Once you're cleared for installation, draw your layout plan and mark it out on your property with flags. The flags will not only guide you when you dig your trench, but they will also provide visual reinforcement when training your dog to understand his boundaries.
Now grab your spade and following your markings, dig a trench about three to four inches deep for your wires. There you will connect to your transmitter. Once connected, plug in your transmitter and test the system. If everything is in order, you can bury the wires. With the physical installation complete, you will then need to turn your focus to training your dog.
It is important to note that these are just your basic steps. There are a number of helpful YouTube videos that can walk you through the process more thoroughly.