When the going gets tough, the tough gets going. I know that this looks a little intimidating to draw, but take it easy and you'll be fine. You see those two lines that fan out on either side that you drew earlier? Those are used for the slant guideline. Every line out on the sides should be almost parallel to that line. As long as you try to keep it so, it should be no problem to finish this step. If you want, you can even imagine the two sides as wings.