A.H.
I hung my son's comforter using two safety pins and two nails. I put a safety pin on each of the top two corners of the blanket (on the back side, facing the wall). Then hammered in two nails and hung the safety pins on the nails. The great thing about this approach (besides being super easy) is if the blanket is crooked, instead of moving the nails you can just move the safety pins.
Good luck!