Attention in the Present

I have read your book, The Seven Spiritual Laws of Success and most of the Laws seem quite straightforward to me, except the law of intention and desire. I do not understand how to apply it. Especially when it comes to putting your attention in the present moment. I try to do that but my mind slips away in mere minutes. Also, when that happens, I try harder to keep my mind in the present moment but in the end it becomes a struggle and I end up tired. What exactly is having present moment awareness and how to achieve it? Are there any practices that can help me achieve it? Please advice. Thank you very much!