I have had some limited success in openning the chakras. I recommend pranayama yoga, which is a series of postures and breathing exercises. I also believe it is safer to bring energy down from above than to draw energy up the kundalini. By drawing energy down, you awaken the higher chakras first and are more equipt to handle the powerful impulses that you will feel when the lower chakras begin to open. The key to openning the chakras is the visualization of energy as white light flooding the area of the body as you meditate. This visualization becomes the mental trigger that with time and practice you can use to open and energize the chakras at will. When a chakra opens you will feel like you are unclenching a fist and life and light floods the area of your body. If you have built up mental associations with your exercises, you will also experience a set of mental connections that you had not made before. But it is better to concentrate on small steps rather than on epiphanies.