Go to Radio Shack and buy some LED's, the size is T1 (3mm). Use a small screwdriver to remove and pry open the switches. Be careful of how the little copper pins fall out, they have to go back in the same way. The best way to ensure that they fall out so you know how to replace them is to have the switch upside down when you pry it apart. Snip out the LED that is in there, being sure to NOT snip out the resistor.
Yes, any thing that runs electricity through it is directional...for the most part. The back of the LED package will tell you witch prong is + and which one is -. Hook the positive one up to the resistor.
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