Q.Root A Cutting Ocotillo?
would you know how hard or easy to root a cutting of a ocotillo

Certified GKH Gardening Expert
Sure! Doing so is not a difficult process, but take extra cuttings. They tend to be pretty unreliable at rooting. Some will and some won't root, so taking extra cuttings will ensure that you get, at least, one.
Here are some articles that will help:
https://www.gardeningknowhow.com/ornamental/cacti-succulents/ocotillo/ocotillo-plant.htm
https://www.gardeningknowhow.com/garden-how-to/propagation/cuttings/root-stimulating-hormone.htm