Okay, I couldn't resist a reply. I have used different types of feathers for Naitve American regalia and ceremony. From the large shafts, wings, and fluff for small crafts like dream catchers , etc.
For a wing steam, slowly spread or fan out, than freeze.
For the fluff or down - soak with mild or dish soap, air dry, than freeze.
For the large shafts or structured - steaming works very good, hand wash, air dry, then freeze.
The air drying is faster than dryer. I was taught never to put in a washer the agitator will ruin or "break" the natural form of the feather. You want to maintain the natural form it will last longer and is aesthetically pleasing.
Many people do not know there are two side of a feather other than the front and back side.
Before freezing or crafting the feather. With the index and middle fingers slowly move up the shaft to put the quivers in proper place. If done right, the quivers will tighten and you there wil not be any light between them. Very good feathers to use to paint or dye