yah, like Knot said. I am not mechanically inclined and have thrown/dropped my chain twice now.

the first time was a pretty bad experience because i was so sure i had done everything right! but i got off, put the chain back on lifted the rear wheel, spun the pedal and got back on the bike.
DH carries rubber gloves (they weigh almost nothing) so that if a chain comes off you don't have to get dirty.

and then when you start getting used to it, you can start loving your chain by cleaning it and applying chain lube to it. THEN you start feeling like a real bike owner.

they are messy things but easy to deal with.

oh, one more thing. If you drop your chain and your bike is still moving, sometimes you can shift back up to the higher gear and the chain goes back on BY ITSELF!