I learnt from the same source, this video is great work.

IMHO the rolling-X is key to correctly honing a smile, but it takes time and patience to learn the trick.
It was indeed a risk to start on such a beauty (love the scales), yet, while I tried to get the feeling of it on a cheap razor and hardly could, it's only when I got to one of my most cherished at the time that it went perfectly, producing a wonderful razor.

I sometimes think that it is because I was particularly careful because I loved the razor that I could get it.

Anyway, good job !