While it's best to go to a professional, it is possible to give yourself a DIY A-line cut. Start by parting your hair in the center, then create two side sections starting just behind your ear and clip them out of the way. Next, begin cutting the back section, ensuring it is all the same length. Once you have cut an even back section, it's time to create the A-line effect. Release the side sections and begin cutting on an angle from where they meet the back section. Working from back to front means you can create a more even, graduated line and control the angle of your A-line cut.