Merkaba meditation is the key for it. Meditate for it, practice with a lot of patience and you will achieve it.
When you learn about the Merkaba, you will not only intellectually understand the geometric fields, but you will personally experience them and feel them tangibly around your body. These geometric energy fields around our bodies can be turned on in a particular way, which is also connected to our breath. The Merkaba meditation incorporates a 17-breath process along with mudras (hand positions) that are a key to the correct use of the Merkaba.
Activating the Merkaba through the 17-breath meditation will result in deeper contact with your Higher Self and it will strengthen every aspect of your life. You will be better able to relieve your stress, balance your mind and emotions, and heal yourself if the Merkaba is used often and consistently. Most importantly, you will experience and remember your intimate connection with God in a safe and nurturing environment.
Learning the steps of the Merkaba meditation alone is not enough to fully experience the benefits of an activated Merkaba. Anyone can learn technical steps through a book or video. There is at least one other factor that is even more important than learning the Merkaba meditation itself -- the opening of the heart and the experiencing of Divine Love. It is Divine or Unconditional Love that is the primary factor that allows the Merkaba to become a living field of light. Without Divine Love, the Merkaba will only be a series of steps and will have many limitations.
I don't think I can instruct this meditation step by step as some great articles do, so I will give you a direct link to a decent meditation instructions for Merkaba activation: