In the case of bilateral treaties, ratification is usually accomplished by exchanging the requisite instruments, while in the case of multilateral treaties the usual procedure is for the depositary to collect the ratifications of all states, keeping all parties informed of the situation.
Trump does indeed have hands just below average size, particularly for a man standing 6-foot-2. According to various human anatomy websites, the average-height American adult male (5-foot-10) has an average hand size (measured from the tip of the middle finger to the wrist) of 7.44 inches. Trump's measures 7.25 inches. (His shoe size, incidentally, is reportedly 12, but THR editors have so far been unable to locate a Trump footprint).
The world's largest shoes are 5.29 meters long, 2.37 meters wide and 1.83 meters high and could hold 30 pairs of normal feet. If you were big enough to fill the shoes you'd be about 125 feet tall. The world's largest feet and and shoe size can be found here. World's Largest Shoes.