Driving there is probably the easiest way.
Google maps would be your best bet because im not sure where you're coming from.
Mapping software is your best bet. There aren't really any landmarks other than the destination itself.
GPS
I just use Google Maps. I go there from MD, and like to take White's Ferry across the Potomac. It's 1hour, 15 minutes from there. Basically US-15 S to VA-7 W to US-340 S. It's on the corner where US-340 S turns left and combines with US-522S. It's in the middle of nowhere, but easy to find.
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