Sit or lie comfortably.
Close your eyes.
Make no effort to control the breath; simply breathe naturally.
Focus your attention on the breath and how your body moves with each inhalation & exhalation. Observe your chest, shoulders, rib cage, & belly. If your mind wanders, simply return your focus back to the breath.
Maintain the meditation practice for 10-15 minutes to start, and then try it for longer periods.
Meditation works! Several studies have proven its efficacy for a wide variety of conditions - from managing/preventing disease to lowering stress & improving sleep quality/quantity.
Give it a try!