@mrsclem , I began thinking about life without a pond a couple of years before hand.
Finding my koi a good home was my first priority. I wrote e-mail after e-mail to various koi clubs and rescues in hopes of finding my four adult koi, a good placement.. You might not have this challenge as you've sold koi through the years. No one was interested in my pond grade koi , who I adored.
I finally found an owner of a koi / fish farm who said he was interested. I didn't get any money for them, was just relieved they were moving to a better pond than mine with an experienced ponder.
I ran our pond for another year without any fish, enjoying the water gardening. At the end of that season, we decided to close the pond and loaded up all equipment and gave it to the man who'd taken our koi. I felt he truly deserved it and I didn't have the time to clean and list all the equipment for sale.