I just bought a house that has two mature pecan trees. I was told to gather the pecans once the outer shells turn brown and start to peel away from the inner shell. I also picked all of the green nuts that had fallen. When I opened the nuts inside the brown shells (about 20), they were all dried out already! I opened a few of the green nuts, and the nuts were not dried out, but slightly bitter. Any suggestions on how to harvest? My trees are very tall, and I can barely reach the bottom limbs with a shovel, so shaking them is not really an option...