Set one 8-inch post on the ground at the location where it will stand in the fence. Lay the end of another 8-inch post across the first post so that they overlap about 1 foot from the end of each post and sit at a 60 degree angle.
Set a 80D spike into the top post where the two posts meet. Drive the spike through the first post with a sledgehammer and into the second post.
Lay the ends of the 6-foot. wooden pole across the ends of the posts to form and an A-frame. Nail the wooden pole to the wooden posts with 60D nails.
Construct another A-frame in a similar manner 10 feet down along the fence line from the first A-frame.
Stand the A-frames up and align them perpendicular to and centered along the fence line. Check the level of the A-frame. Brace each A-frame with two 6-foot poles.
Place a 12-foot. pole across the outside post of each A-frame approximately 10 inches from the ground. Nail the pole to each A-frame. Place another 12-foot pole 1 foot above the first pole and nail in place. Continue this process with four more 12-foot poles, working up the outside of the fence to the crossover point of the posts in the A-frame.
Place the remaining 12-foot pole across the inside post of each A-frame approximately 10 inches from the ground. Nail the pole to each A-frame. Remove the bracing poles on the A-frames. This completes a single section of the fence.