Denny,
You didn't specify decklid tailight or fender taillight. No need to disconnect battery unless taillight is on and the indicator light will go off when you replace the bulb (no reset necessary). Decklid- open the access cover, remove 2 phillips screws, pop out light assembly to get to the bulbs. Fender- remove the trunk liner in the back corner (by toolkit compartment or opposite side), remove 2-10mm bolts, release 2 snap pins on the side (bump with hand), take the assembly loose (1/4 turn counterclockwise), and you have access to the bulbs. Hope this helps! Ann and Wayne