I, too, have good hearing at low frequency but a profound loss above 1,500 hz. That is a difficult situation to treat. From my personal experience you may have difficulty getting good results on your first try. It takes your brain a long time to figure out what the sounds provided to your ears by your hearing aids mean because your brain hasn't heard that sound for a long time. For 20+ years and 5 different hearing aids I could hear some birds and crickets but they did little to improve my speech understanding. Only recently, with a change to the receivers in my hearing aids have I had a significant improvement.

Again, good luck and stick with it.