Lining up your beard will help you achieve the shape and look that you want, but you will need the right tools to do so. Start by combing your beard. You will then want to visualize a straight line from your sideburns to your mustache. This line should be straight, starting at the bottom of your sideburn and reaching upwards towards your mustache. To mark this line, you can use an eyeliner pencil or something similar, which will act as a guideline for where you intend to trim.