If your house has gutters, you can
hang holiday lights from them without leaving the ground. And all you need are an 8-ft. 1x2, a strong magnet and some galvanized steel plumber's hanger strap.
Cut the hanger strap into 7-in. sections, bend the sections into hooks, and attach the hooks to the string of lights every 5 ft. or so.
Screw the magnet to the 1x2, and hang the hooks on the gutter one at a time. This is a bit more difficult on a two-story house. You have to screw two or three 1x2s together to reach the gutters, and 'grabbing' the hooks with the magnet as they hang far above you is trickier. But it's still better than climbing a ladder.