Yes and no. You don't necessarily need all the fancy pipes, fridges and pumps of a pub, but you need at least a beer tap (assuming its that sort of barrel) to do it properly. This is a tapered pipe with a tap on the end. You bash it into the hole at the end of the barrel. You might be able to borrow one from a pub, no idea where you'd buy one.
Remember, being lager, it will be under some pressure, so if you do just open it, you will either loose all the pressure (and your beer will go flat) or a loose a spurt of pressurised beer. Once the pressue has abated, you'll need to gently let in air, via the side hole, while you extract beer.
The keep it properly, you need to replace the lager extracted by CO2 gas, so your barrel will go off a lot faster than a pub's. Drink it fast!
If you can't do any of this then the best method is probably to stand the barrel on its end, open it and siphon out beer as required. Try to reseal it when not being used to keep the CO2 in.
And keep it cool.