I removed the headrests from these seats when I shipped them,
There is a clip that goes around one of the rods. Just remove it and the headrest comes out. I had to gain access from the back of the seat by pulling off the plastic covering over the back of the seat.
putting in the clip shouldn't be too hard as long as you are not in front of the UPS Drop off Center with no tools and it's hot as heck outside trying to fit 2 seats into one large box.