Bigs, I've had three. The other guys are right. Once it's passed it won't hurt anymore. Just make sure you drink tons of fluids. That's what helps it move. My first stone took two weeks to go from kidney to bladder. The other two I drank as much water as I could and they passed in a few days each.
One word of advice....when you go to pee it out, you'll feel it hit the entrance to the pee tube (not sure of the medical term lol). Whatever you do, don't stop peeing! If it's jagged like mine was, you can imagine what it would do to the inside your you know what.....