learn how to change a flat tire

I never want to be that girl standing on the side of the road with her emergency lights flashing, freaking out because my cell phone is dead and I have no charger, and even though I have a spare tire & a jack in my trunk, I have no knowledge of how to change a flat. NO WAY! I want to be able to do it myself…so that I’m not dependent on others, and it will save time as well…esp. in an emergency situation when I can’t get ahold of anyone else or its late or something. Especially in today’s day and age…I don’t want to be standing on the side of the road alone anywhere – and definitely not at night!