I did it the same way as you, Granama. The second, third, fourth and fifth clues were all unsolved till I had got the endgame.
As others have said, the puzzle was brilliant. The way Phi dealt with the quotation was very clever, and there was a neat link between the quotation and the title of the puzzle.
I think the preamble could have been more clearly worded. I was held up for a very long time trying to see how the 8s could be entered. The example given in the little sketch was not as helpful as it appeared at first. But thanks to Phi for yet another good one!