I have an old hollow black cherry tree and sandhills hornets moved in this year. The hole is about one foot from the ground. How can I get rid of the nest without a professional?
Don't try it yourself. Although you can flood the nest and kill most of the hornets, there should be some other hornet flying outside, which can attack you right away.
Don't hesitate to contact your local bureau for environmental protection or pest control group. Just a phone call to them, and they should eliminate the hornet for free ( That's their job! ) . When they arrive, remember to keep your windows closed.
If you're not averse to using insecticides, then you'll find several in any of the home repair big-box stores, that specifically target hornets and wasps. Just make sure you cover yourself well from head to toe, eye protection, etc. the full deal (with as many layers as you can... you really don't want to get stung).
Most of these sprays work from afar (about 5-10 feet away), so you won't have to get too close to the nest. However, do remember to spray it only at night time, as that's when the hornets are mostly inactive (a.k.a taking a few winks).
Lastly and most importantly, don't forget to read the directions on the can!