The best advice is to quit "trying" to meditate. Don't force it if it's not coming naturally to you. Let your body adjust to the concept of meditation. Just start out with a 3-5 minute session at a time and don't progress in length until you've "mastered" the previous time frame. Just sit (or lie) in stillness. Listen to your breath. Be mindful of what you hear, without any judgement or thought. Just listen. Deep breathing helps to focus the body and mind. Once you've learned to quieten your mind, add a bit of guidance to the meditation- direct your mind. Make any sense?