Set a stringline for the post tops. Allow a gap of up to 100mm below and 50mm above each panel, with the latch post extending 300mm above the gate. Position the posts in holes and fill with concrete, sloping the surface for runoff.
Slide the panel brackets over the top and base rails, raising them into position on temporary blocks. Use a spirit level to check the fencing panels are level, then secure the brackets to the posts with self-drilling Tek screws.
If the fence needs to negotiate an angle other than 90º, change the direction of the fencing by cutting the ends of the panel rails using an angle grinder with a cutoff wheel. Touch up the cut ends with spray paint.
Attach the self-closing hinges to the outside of the gate using Tek screws, 80mm from the top rails and level with the base rail. Space the gate evenly, using a torpedo level to check the gate is level.
Secure the latch at least 1500mm above ground level, closing the gate with it in position. Tap in the post caps, then adjust the springs on the hinges to ensure the gate will close from any opened position automatically.