A good barbed wire fence is ridiculously expensive to have built around here. Since your ground sounds open and not rocky, you could build it yourself. It is a ton of work, especially by yourself. Catscratch had a lot of great info. Absolutely wear safety glasses. That coiled wire springs back at you when you least expect it. Wear thick leather gloves and a long sleeve shirt or you will be bleeding. Actually you WILL be bleeding anyway, just not as much. Buy or build your own receiver hitch spike to hold the wire roll. They sell a tool so you can carry the roll around and allow it to rotate. I don't know how much a roll of wire weighs, but they are heavy enough to be a pain in the ass and it will be catching and tearing your clothes up without the tool. Since you aren't worried about livestock don't build it too high. The deer will get caught in the top wire if it is too high and they will tear up the fence.