Understand how to work the puller. There are two types of fuses commonly used in vehicles and other applications. One type is a cylindrical glass fuse with a metal contact on each end. The metal contacts slip into clips that hold the fuse in place. The other type of fuse commonly used is a flat blade fuse. These fuses have two metal blades that stick out of one side and plug into clips to complete the circuit.
Consult any documentation for the unit that you are repairing. Determine where the fuse location is. If there are many fuses in this location determine how to find the fuse that you need to check and replace. Fuse blocks are common and sometimes are difficult to determine which exact fuse you need. Use all the information that you have to determine the correct one. Make sure you know what amperage the fuse is and what amperage the fuses next to it are so you can double check that you have the correct one before pulling it.
Use the end that is appropriate for the fuse that you are going to pull. Grasp the puller by your thumb and forefinger. Slip the end of the puller over the middle of the fuse and tighten the puller around the fuse by pressing your thumb and finger together. When you have a firm grip on the fuse, pull the fuse from the clips that hold it in place.