Once you have a pure, high-quality essential oil, a good way to start using it is to dilute it in a carrier oil and then either apply it to the skin or diffuse it into the air. The goal is to be able to inhale the essential oil safely.Once you have a pure, high-quality essential oil, a good way to start using it is to dilute it in a carrier oil and then either apply it to the skin or diffuse it into the air. The goal is to be able to inhale the essential oil safely.