When mining for Cursed Tools or Accessories, control your fall. Uncover the hole, then save. Reload if you fall too far or not far enough. Remember that you can lose 100 Stamina if you fall 100 floors.
When you reach a Floor with Cursed Tool or Accessory, save immediately then find the location of the item and reload. Go to the spot and save before uncovering. Each time you reload, you will get a different item. Choose the one you want before saving the game!