Ruth, I was just going to add Ms. Newman's methodology which I use every time I thread a silk thread to hand applique. I love YLI thread also. I have used others (Gutermann) and they are OK but not nearly as fine (small size thread) as YLI. That's what Luxin uses also.
My very first applique class was taught by someone who advocated NOTHING BUT COTTON thread because it was being used on cotton fabric. But after I used silk thread, there was just no comparison in ability to really attend to the finer details of hand applique. Her concern was the strength of silk/vs/cotton fibers and the silk wearing through the cotton fabric.
I'm 62 and I figure I'll be long gone when that happens, and they can fuss at me in my grave!