Dig large holes in the ground for the posts, equally spaced on-center with the width of the fence panels you have. The holes should be at least 2 feet deep.
Put 4-by-4-inch posts in the ground, the height of which depends on the height of the fence panels.
Pour concrete into the holes around the posts, bracing them with ropes if necessary. Allow the concrete to set completely before moving on.
Attach each fence panel to the posts individually with the help of a friend, ensuring that you leave room on the unfinished side for the adjacent panel. Screw each panel into place using stainless steel screws, each measuring the depth of the ledges plus the 3 ½-inch thickness of the fence post.