It really isn't hard and you shouldn't need a metal detector if your property has been properly surveyed and staked.
If you don't already have one, get a copy of your deed or plat from your PVA office. It will have the dimensions of your property. Once you have the layout, go to the road in front corner (either side) of the property and look in the centerline of the pavement for a concrete pin. This pin will give you a starting point and you can measure from there. You should have a pin at every corner or bend. The back side (soil areas) will usually be a piece of rebar with a plastic yellow cap over the end, but may be a concrete pillar, stone, or pre-existing corner post. You may have also see some old orange flagging or paint in the pin areas to help locate. You may even find a wood stake driven close to it or laying near the area for a visual marker if it was surveyed within recent years.
If you can not find any pins, you may want to see who did the initial survey for the plat. If it is a big company you might not have much luck, but you can contact them and ask about the pin locations or how they may have left visual markers. Most of them are pretty consistent in their work so they may be able to help you find them without having to have it re-surveyed.
Hope it helps,