Yes, hydrangeas are super easy to root from a cutting. Just snip off a pencil thick section of branch and remove the lowest leaves from the  cutting.  Poke into moist potting soil so that the nodes or bumps on the stem that once had leaves is now in the soil. You should have no more than two leaves on the top of the cutting poking out of the soil. Remove any other leaves if they are attached to the cutting. Keep the soil moist and the cutting in the shade. Next spring you should have enough roots to transplant the new hydrangea into the ground. Cuttings from soft wood shrubs like this take best when done in June or July. Dipping the cut end into a rooting hormone is not necessary with hydrangeas. I have some new hydrangea plants in my garden that rooted just from left over pruning crumbs that fell to the ground - I never got around to cleaning them up and months later they had formed roots right where they fell. Plants are amazing and so enjoy experimenting with different ways to make new plants. Keep growing, Marianne Binetti