Energy barrier shifting with colour of varying degree and intensity. Like looking at a soap bubble when sunlight hits it the right way.
Best used to defend against general spellcraft type attacks/energies and minor darkness based energies.
Easy, provided you are familiar, and comfortable with, your energy signature.
Visualize a glow about your body, this is your aura. Concentrating on this, focus your energy into it more and more. Before you project your shield, see the colour shift and change randomly. Once you have achieved this point you are ready to form your shield by simply pushing the energy outwards from yourself GENTLY!
That last part is important since this is what will create the bubble of auric energy about you. If you push too hard the energy will simply burst out flying in all directions and dissipating shortly after, harmelessly.