If possible, wait for a dry day so the leaves are dry in the gutter.
1) Connect the black ripstop nylon air supply tube to the leaf blower, but you won't need to gather any of the 25' long tube on the leaf blower nozzle. Simply place your leaf blower on the lawn behind you.
2) Adjust the telescoping pole length so you can reach the gutter.
3) Now with the Gutter Viper lying on the ground, start the leaf blower and hold the Gutter Viper about 3" above the gutter - then walk along below the gutter as far as you can in both directions to clean them. Make sure that the black ripstop nylon tube doesn't twist so much that it stops airflow to the Gutter Viper (you can tell that if the yellow tongue stops flapping).
4) If you need to reach more gutter, then move the leaf blower in that direction far enough you can reach that section. This technique works very well if you have no large tree branches up against the side of the house to snag the tube on. If you do have trees right next to the house, you can hang the leaf blower from your shoulder (as shown in the video) and work with the black ripstop nylon tube length set to the same length as your telescoping pole.
Safety note: Even though the Gutter Viper will blow the debris out ahead of you, wear safety glasses in case a gust of wind blows debris your way.