Step 1 - Drive your end or corner posts identifying your fence end.
Step 2 - Pull a wire or string etween the two end posts and pull it tight so to establish a straight line between. All brace posts and line posts of this fence section will follow this line insuring you achieve a straight fence on completion.
Step 3 - Establish the proper distance for the brace post by laying the horizontal brace bracket end around the end post and position the brace post at the center of the joint on the other end of the horizontal brace. Drive the brace post at that position aligned with the fence line.