I used to be very efficient at this, however after a lapse in training I've found it alot more difficult to get the the energy flowing through/around me. I try to start it off in my stomach as a small pulsating blue/whiteish ball giving off light and humming sounds. Then I imagine it growing until it fills my whole body, I picture my organs have been replaced by a glowing blue/white light. Then i try to push it through my skin and let it circulate through my aura. Then i would begin my practicing. Usually would do this for about 5-10 minutes before I'd start to practice. After about a month or so I could get it flowing strongly in under a minute.
Is this a good technique? I remember I'd also use my brain to generate alot of energy, however one time I heard a very loud audible "POP" in my head followed with head rush and dizzieness. I thought I had killed myself! So after that incident I decided to stick with using my body to generate this.
Any tips or advice? Was it a bad thing i used my brain to generate the energy? Appreciate any feedback :D