To find the correct screwdriver:
1. Consult your Jeep Liberty's owner's manual: This is the best place to start. The manual will specify the correct tools for removing and replacing the taillights.
2. Visually inspect the screws: Before you start removing anything, take a close look at the screws holding the taillight assembly in place. Note the head type (Phillips, Torx, etc.) and the size. You can often find a size marking on the screw head itself.
3. Use a screw size identification chart: If you're unsure about the size after visual inspection, there are many online charts and tools that can help you identify screw sizes. Take a sample screw (if possible) and compare it to the chart.
4. Go to an auto parts store: Take a sample screw to an auto parts store. Their staff will be able to identify the correct screwdriver.
Without knowing the year of your Jeep Liberty, it's impossible to give you a precise answer.