This is the video that I used to get the 'hang' of it.
I've tried the knot in the past, but wasn't confident enough to use it.
Sometimes I wouldn't tie it correctly and the knot would slip.

The key that I found was holding the tag in the correct position, relative to the eye of the hook, while you tighten the knot.
A few weeks back, I was confident enough to try it on the stream and it worked great.
It wastes little tippet and it's a good, strong knot.

I got to test the knot strength several times throughout the day........on snags, not big fish.

Brian