I washed my first Hermes scarf yesterday. It was an ebay vintage purchase I had just received that was not quite "fresh". In fact, it stunk to high heaven. I was not as nervous as I would be otherwise, since I have washed some other, less expensive, vintage silk scarves and they finished out brilliantly. But, yes, my jaw was still quite tight as I moved through the steps!
My process: Warm water wash, followed by immediate dunking in cold water rinses, followed immediately by laying the scarf flat on a large thick towel and rolling it up. I ironed the back side of the scarf whilst it was still damp, moving the iron plate up to the edge of the rolled hem. I rotated the scarf as I ironed to assure that it didn't "pull" in one direction or the other.
Since the hems were still damp, I did the first three folds and hung it from a pants hanger to finish drying. And I was thrilled with the result! No color loss, lovely plumped up hems, and a complete removal of all odors.
But I will say this, that first dunk in the warm water wash is going to scare the bejeesus out of you! The wash water is going to turn a murky, ugly color. Just remember to keep it moving. The scarf I was washing was "Ramses" in a red color way with a lot of white background. I had absolutely no color transfer from the red to the white, which is what I most feared.
So, yes, it can be done. Just have the two sinks ready and filled with the correct temperature of water, and have the towel prepared as you pull the scarf through its last rinse. (I made sure to lift from two corners with no parts touching any other parts to avoid last minute dye transfer.) The hardest part? Screwing up your courage!