Changing out a light fixture can be an easy, relatively quick way to update a room, and it can often make a dramatic difference. Here's a quick guide on removing the old fixture, leaving just what you need to connect your new one. Here we go...
What You Need:
• safety glasses
• circuit tester
• screwdriver
• stepstool or ladder
Instructions

1. First, shut off the power at the breaker or fuse box. If yours isn't labeled, it may take a few tries to be sure the correct part of the room is shut off; if in doubt, you can go ahead and shut the power off in the entire house just to be sure. If you have a fuse box, unscrew the proper fuse and set it aside.

2. Time to remove the light. The steps to remove your fixture will vary according to what type of fixture it is; today we are removing a standard flushmount light — most have a knob that twists off at the base of the fixture. In most cases, you can just unscrew the knob, but this fixture required us to twist the glass bowl around — be sure you have a good hold on the glass to keep it steady!

3. Get sprinkled liberally with dust and dead bugs.

4. After the bowl is off, you can see your bulbs and fixture base. Unscrew the bulbs and set aside.


5. Use a screwdriver to loosen the two screws holding the plate to the mounting bracket in the ceiling. Gently twist the base of the light to free it from the screws and the mounting bracket. You may need to also unscrew the threaded post that runs through the base of the light into the mounting bracket.

6. Now that the light is free of the ceiling, it's time to disconnect your wiring. If you can see some bare wire between the insulated part and the plastic wire nuts, now would be a great time to use your tester to be sure there is no current in the wires. Follow the instructions on your tester, and keep in mind that the black wire is hot, the white wire is neutral, and the green or copper wire is your ground wire.
After making certain there is no power flowing through your wires, unscrew the wire nuts holding the wires together. You should be able to do this easily by hand. Use a screwdriver to loosen the green screw holding the grounding wire, or if your grounding wire is wrapped around your metal bracket (as ours is), unwrap it. Carefully disentangle the wires of the fixture from the wires in the junction box, and pull it free from the ceiling. You've successfully removed your old fixture and are all set to wire up your new one! You may want to remove the mounting bracket if you need to use a different one for your new fixture, or you may be able to leave it as-is, and connect the new fixture to the old bracket.

Important note: If you don't feel confident about doing an electrical job yourself, don't hesitate to call a pro! However, having said that — mastering the task of removing your own light fixtures is an empowering feeling; and it can save you some money as well!
Now that you've removed your unwanted light fixture, here is a step by step on how to install the new one:
• How To Install a Light Fixture
(Images: Breaker Box: Shutterstock, all others: Sarah Dobbins)


Sheex Bedding
Zzzt - honey please yelp handyman!
Always, always, always test to make sure that you've turned off the correct breaker or disconnected the correct fuse before starting electrical work. I leave the fixture in question on so that when I turn off the correct circuit, I know. Even if your breakers/fuses are labeled, it never hurts to double check. Being electrocuted, on the other hand, always hurts.
I just did this for the first time last week. It was very tricky and very physically strenuous. Holding the light fixture in one hand while untwisting the wires with another, especially if you're not tall and have to do it on the tips of your toes while on a stepladder -- I was sweaty after doing a couple. Putting in new fixtures was much harder, though.
I'd say to turn the power off to the whole house anyway just to be safe. That's what I did when I changed out mine.
Those dome lights SUCK to hang.
I second turning off the whole house, especially if you don't have a tester. Our old house had a crossed wire somewhere and turning off the electric to a circuit did not guarantee that there would be no current running through it. My dad was helping me and got a nasty jolt -- luckily that is all that happened.
I know I read the article, but I'd feel a lot safer if I get my dad to teach it to me. I feel like this is one of those things I really need to learn how to do (along with how to install a toilet).
Buy a current tester if you think you'll be doing more than one electrical job - worth it as getting zapped never gets fun. Also - depending on how your house was wired, you might not have a green ground wire - if your wires are in conduit and its grounded properly to your water service the conduit is the ground so as long as your new light is screwed to the box, it should be grounded. You can always add a ground wire screwed into the metal box if worried.