It is not clear from your question whether the odometer is mechanical or digital. If it is digital, this is likely the beginning symptoms of a cracked solder joint on the circuit board that provides power and mileage information to the odometer display. See the discussion of the problem and options for repair at http://www.odometer-repair.com .
Thomas Alva Edison invented the light bulb in 1879.
Both the driver side and the passenger can be replaced without the use of tools, although a flat head screw driver may be of help... Buy a bulb before you take your car apart ;) To replace first remove the electrical connector, to do this press down on the top of the connector (Iused the flat head screw driver) and pull straight out. Move to be out of the way... Next you will be removing a circular plastic piece which holds the blulb in place, to do this simple grab where the area the electrical connector was plugged in AKA the circular plastic piece and rotate (I did not pay attention to which way) about a half turn or so and it will come off. Put this off to the side, on the ground somewhere you will not lose it ;) Next remove the bulb, just pull it straight out! OK everything is ready for you to add the new bulb, standard rulles apply aka DON'T TOUCH THE BULB! Simple insert the bulb with the flat side up. Put plastic piece back on, you know where it goes now turn until it locks into place. Now reconnect the electrical, push until it snaps, again ensure the connection is on top. Now test!