The best advice I've seen so far is to just cull every cane/branch outside the main stem except vines running on the structure. It would be a year without fruit, but it puts me into a great position for the future.
Not sure if I should just eyeball dead vs live canes during the winter or just cull them all
Yes just trim as told then around march add 5 pounds of steer or cow manure per vine. Other nitrogen-rich grapevine fertilizers. Other nitrogen-rich grapevine fertilizers (such as urea, ammonium nitrate and ammonium sulfate) should be applied after the vine has blossomed or when grapes are about ¼ inch