The secret to wrapping ribbon around a Christmas tree is to start with a length of ribbon that is at least twice the height of the tree. Wrap the ribbon around the tree, starting at the top and working your way down. Make sure to cover the tree's base completely, and try to make the ribbon look even and symmetrical. Use a sharp pair of scissors to trim any excess ribbon, and use the same technique to add any other decorations like bows or lights. Finally, stand back and admire your masterpiece!