how many turkeylukerys does it take to screw in a light bulb?
well first, locate a burned out light bulb. turn off any power flowing to the light bulb. remove batteries, turn the switch to off, unplug it, whatever. grasp burned out light bulb and twist counter-clockwise (lefty loosey) to remove. the bulb may be difficult to access, depending on location and B.A.C. you may need to use a ladder.
if the bulb is stuck, or the retainer turns with the bulb (which is easy to notice if after turning the bulb one turn and releasing it, it turns back a bit) you will need to either hold the retainer with the other hand or disassemble the lamp. for that you need to either unplug the lamp or shut down electricity in your house. keep in mind that normally roof lights and electrical sockets are managed by different fuses, so in case of doubt shut down the electricity for the whole house. Have a flashlight handy if necessary. if the bulb is still stuck, see article How to Change a Stuck Lightbulb.
properly dispose of burned out light bulb. take fresh, non-burned out compact flouresent (CFC) light bulb and gently twist it clockwise (righty tighty ) until it seats with light but firm pressure in the socket. be sure the switch to the light is off when you do this. the CFC bulb will save you money AND each CFC bulb saves about 500 pounds of coal.