No one wants to admit they can't change a tire. But to some, it's a reality.
Don't get stranded on the side of the road waiting for someone to come do it for you - watch this video and you'll see how (relatively) easy it can be.
This video provides step-by-step instructions on changing a tire. Always keep a cloth in your car. Keep your spare tire in good shape and inflated. No use in replacing a flat with another flat.