First mark out the correct Gatepost location. Place the post in the hole and mark out the hinge location. Fit the hinge to the post making sure you have sufficient adjustment to correctly position the gate once the post is set. Place the post in the hole and fit the rails into the post. Before the rails are slid into the post block the ends of the rails with adhesive tape. Brace the post if required. Drive a single 12mm Steel Re-enforcing bar through the centre of the post into the soil then core fill the post with a wet mix concrete. After the concrete has set you can bolt the gate to the hinge.