Blowing a bulb on a Christmas tree can be frustrating, but it's usually not too difficult to find and replace the bulb. Here's how to do it: 1) Turn off the tree and unplug it from the outlet. 2) Use a ladder or a stool to reach the top of the tree, if necessary. 3) Look for any blown bulbs or loose connections, especially in areas where the branches connect to the trunk. 4) If you find a blown bulb, carefully remove it and replace it with a new one of the same type.