I haven't but did see that one. Anything that says challenging I have stayed away from as I am not at the point I want to challenge anything. I have done Y-seams though. I found several tutorials online available. I needed to be shown what I needed to do so when reading the pattern it was simplified as I could then envision what it is the pattern wanted me to do.
Here is Jinny Beyers tutorial, hand and machine seams. I learned quickly and am pleased with what I can now do.
http://www.youtube.com/watch?v=08AlOM5COBU