One of the best artists I’ve known personally, James A Crombie ARCA, AMGP, said to me “If you think you know everything in a medium, you have no where else to go with it”. He was in his eighties at the time.
Painting by hand with brushes in the medium of stained glass is something I’ve been refining for decades. Usually I get John to paint the figures, I’m either designing or cartooning, but I do believe it to be important if not essential to pick up some brushes and “go with it”, as I’m doing on our latest window “The Vision of the Valley of Dry Bones”.