Insert stakes into the ground at the corners of the area you want to enclose, and run a length of mason's twine around them. Measure the twine to determine the amount of welded wire you need for the project. Also measure and mark the ground every 8 to 10 feet along the fence line for line posts.
Dig post holes for wooden or steel posts using a post hole digger. Keep each hole 24 to 36 inches deep, and 3 to 4 inches wider than the width of the post. Tamp the base of each hole to provide a stable footing for the post.
Stand a post vertically in a hole and check it is plumb using a 4-foot level. Align the post, if necessary, so it stands erect. Enlist a helper to hold the post while you pour pre-mixed concrete around it into the hole until 2 inches from the top. Hold the post for ten minutes to let the concrete cure before moving to the adjacent post and repeating the process. When the concrete cures, pack dirt into each hole until level with the surrounding soil line.
Stand the roll of welded wire against a corner post. Enlist a helper to hold the edge of the wire flat against the post while you insert 2-inch galvanized staples to secure it in place. Insert the staples along the entire length of the post yo keep the wire from coming loose.
Pull the wire taut as you walk towards the adjacent post and repeat the process of joining the wire to it with staples. If the wire falls short at any point, splice it at a post by cutting its excess length off with wire cutters. Attach the wire end to the post with staples, and staple the end of another roll of wire to the same post before extending it to the adjacent posts. This practice prevents breaks in the fence line and provides an uninterrupted, uniform fencing option.