I think that I'm scared too, after reading more. I also tried them and found them somewhat difficult. For me, the key is making them a bit bigger and then cutting them back down to size. IOW, I start with a square that is bigger than I need, sew those together down the middle, trim in half, press, and trim again.
Lots of work. I don't have starch available, that I've seen, so I'd have to make my own. I really don't want to do that as it gives me the creeps to basically soak my fabric in a flour/starch water mixture and then sew on it.
I suppose I pay the price for that feeling, but I suppose I lived in FL too long where bugs like flour....