
Drive a 1x2 stake firmly into the ground, marking each end of the fence line. Drive a small nail into the top of each stake marking what will be the center of the fence posts. Stakes typically project 4 to 6 inches above ground; however, taller stakes may be required for the string to clear low obstructions along the fence line.
Digging the postholes will obliterate all your layout marks. Erect batter boards to make it easy to reestablish them. To build batter boards, drive two stakes about a foot apart, a few feet beyond each corner stake. Connect them with a crosspiece. Stretch mason's twine from crosspiece to crosspiece, positioning it so that it crosses the nail on the corner stakes. (Fig. 1)