Restretch guide string and check holes for accuracy visually and/or by placing a post in the hole and plumbing in all directions. This will change your post spacing. Installing Wire Fence – useful tips & guidelines to help you build the wire fence you need. Different heights, size and spacing of mesh openings, finishes and gauges of wire fence are available to fit every use. T posts can be driven into the ground using a manual post driver with handles.