Maybe I’m even weirder than I thought but it didn’t seem too difficult to me, but finger grip strength and side of finger skin toughness and grippiness probably make a big difference. Instead of coming from below the pinky is attached normally and wraps around just below the factory seal ring. Instead of on top, index and middle finger both oppose thumb for more torque. Hold with bottle upright on table with slight downward force if the initial turn is too tight.

The other image after closer inspection I don’t even know what its meant to be. At first I thought is was a syringe but the blood donation clinic nurses single hand triple wield that shit easier than I can syringe feed a parrot that could bite my fingers to the bone. It says screwing motion but I have taken apart and assembled so many things without the proper tools or clamps, behind object towards self screw driving without magnetic bits, etc., and I can’t think of a single situation where I would do that even if I had alien mirror hands.