To install, first, remove any existing garden edging. Next, plan to set the border with the top edge about 12 mm above the soil level to maintain the lawn/garden separation and keep roots from crossing over the top. This makes the border almost invisible and allows you to mow right over the top. However, be aware that the thin top edge can hurt bare feet. After cutting it, make sure you round off any sharp edges with a file.
For straight lines, use a string line stretched taut from either end. For curves, use chalk or spray paint to mark out your design. You can also freely install aluminium edge as you go, without a design.