All the tools to balance your 3rd or Solar Plexus Chakra will help to increase your inner power and strength and therefore, your self confidence. 

As I am reading Serge Kahili King's new book, "Creating Reality," I see how many of the same tools are used in the Hawaiian shamanic tradition.  King describes shamanic tools using four levels or world views for increasing self esteem...

On the physical level, or in the objective world view, King recommends skill development - increasing your energy, strength of body and mind, and consciously changing your posture. On the second or subjective level, he recommends self talk - self praise and increasing your aura; on the third level or symbolic level - creative visualization, guided imagery, dreamwork; and on the fourth level, or holistic level where we are all one,  modeling the behavior of someone/something you’d like to emulate. Check out Huna wisdom at www.Huna.org.

 
 
If you want to use your aura as a tool to check your own or someone else's state of health and mind and do something about it, I recommend reading Serge Kahili King's new book "Changing Reality."

To help increase your aura, he recommends: 1) deep, slow breathing, 2) imagine your aura expanding, and 3) imagine a ball of light sitting on top of your head and filling you with energy.  Do all three at once for the greatest effect.

I realized when doing this how similar this exercise is to the "Medicine Buddha" meditation I learned long ago.  In that meditation, you would imagine light coming from the hands of the Buddha, Quan Yin, Jesus Christ or the powerful deity of your choice, breathe in the healing light and then breathe it out through your body out into the world. In essence, I believe it is essentially the same exercise, but giving the ball of light above your head more power, by having the light come from a powerful source.
 
 
Becca, which would you recommend to test whether my chakras are balanced - my own intuition, a questionnaire about my traits, or using a pendulum?
Inconsistent

Dear Inconsistent,
All three methods you've used are valid. Test the results - perform chakra balancing techniques and see which method give you better answers.

In his new book, Changing Reality, Serge Kahili King, PhD, gives a good explanation of how best to use a pendulum, as I do in my chakra workshops. "A pendulum - any object hung on a string or chain that is able to swing freely - works by responding to micro-muscular movements of your fingers, which are themselves responding to a focused question that you ask about something... you can choose what meaning to give to the following kinds of responses: clockwise circle; counter-clockwise circle; back and forth swing; side-to-side swing."  I have also experienced a perfectly still pendulum when a chakra is closed.  There's more info on how I use the pendulum in the prologue to The Chakra Diaries.  And my favorite pendulum is a pointed lava rock embedded with olivine crystal, formed by the heat of the volcanic eruptions on the Big Island in the 1960's, hanging from a silver chain.  Namaste! Becca Chopra