With your left hand, hold the brush with your thumb on the end cap of the brush. Gently insert your pointer finger between the squeeges, your middle finger supporting the brush and your ring finger on the wiper brush and your little finger backing the brush assembly.

With your Right hand, thumb on the down arrow, pointer finger under the up arrow, you should be able to open the brush at both ends.

With your right thumb, middle and ring fingers slightly lift the end of the brush and pull the brush from the assembly while supporting the brush with the middle finger of your left hand until it is clear of the bearing on the left endcap.