Aura of protection question.

I want to make sure that I am doing it correctly. When I do the meditation I breath in white/gold protective energy from a ball of imagined light that is in front of me. Upon exhale I grow this ball of light brighter and repeat the affirmation. I imagine the light entering my lungs and absorbing into my body. Also with Aura cleaning should I be imagining the light to have a protective barrier of sorts (like an egg) or is just being totally engulfed in this light the correct method. Hail Satan!