To install the Amerimax 85470-XCP75 Gutter Guard, follow these steps: Measure: Begin by measuring the length of the gutter where you intend to install the gutter guard. Cut to Size: Use a hacksaw to cut the gutter guard to the appropriate length. Bend the Ends: With a pair of pliers, bend the ends of the gutter guard so that they fit snugly around the gutter. Attach Securely: Finally, use screws or nails to attach the gutter guard to the gutter.