How do I swing the cylinder out to the left?
Assuming you are right handed and the gun is in the right hand, and with the latch pressed with your right thumb, wrap the left hand around the bottom of the gun and use the fingers to press the cylinder to the left. Use the left thumb to restrain the cylinder movement so it is not too fast.
What is the proper technique to press the cylinder back in?
Hold the gun as in the first reply, and use the left thumb to press the cylinder into place, and your fingers to keep it from moving too fast.