[font=Verdana]Cactus pads (nopales, nopalitos) are edible indeed, but a pain to harvest, with or without the thorns. [/font]
It's easier and tastier to pic them before the thorns have hardened but if the thorns have hardened then a quick blast with a "pear burner" (a propane torch made for cactus or weeds) will remove the thorns for harvesting.
For planting in the spring take healthy petals (with the thorns) and bury them 1/2 way upright in loose sandy soil and water lightly once a week as needed till new growth starts.