Hi Cygne18 - Congrats on your beautiful new scarf!! You have tied it beautifully in a loose cowboy knot. Yes, this one is the thick silk and quite a lot of material. But with a little patience, I have no doubt that you will learn to tame the beast!!
For the twisted loop knot, it's basically what PbP described. Start with a bias fold and drape around the back of your neck with the two tails hanging down in front of you. Make sure they are even and then cross them over each other twice around chest level or a little lower. Then take the two tails and tie a knot in the back of your neck. To play around with making it look casual/sloppy, give the tails a twist or two before crossing them over or even after crossing them and see if you like that better. I hope that makes sense and let me know if it works out for you.