Seeing and feeling aura's is a basic magick skill so don't be too intimidated by it. It usually comes through meditation and doing basic magick exercises a couple Ive posted earlier in this forum. It takes time to learn no matter what.
As said above there are some exercises to develop the skill of sensing / seeing auras. Your aura is the electromagnetic field of energy surrounding your body and forms your personal energy space. This is a natural thing, and also the ability to see / sense it is nothing extraordinary or impossible.
Here's a good article about seeing and sensing auras:
Later, after you get into some techniques of seeing auras, practice for some period and develop your skills I'd advice you to take the next step and learn reading the auras you see. You may find this article as very informative and helpful for this:
But please remember to be patient with this. In some cases, it may take years of practice and study before a person is able to see the entire aura and all of its intricacies and components. But any person can begin to detect slight indications of the energy field with little effort, and usually in a matter of minutes if they can attain and maintain the correct brain state. You must be willing to meditate in order to see auras. You may find other articles that interest you about this subject...
Start by developing you physical senses. Train yourself to be more observent, to notice more when you are looking, listening, and feeling. Lower your threshold of observation. Remember, your astral senses are just your physical senses on an astral level.
Once you have done that, start practicing at seeing auras. It just requires practice. Practice with someone standing in front of a solid, light color wall. Relax your eyes, like you are looking at something far away, and the other person is just in the way. Look mainly around the head and shoulders. You'll notice the Etheric Double first, the thin, light blue outline surrounding the body. Keep practicing, and soon you'll be seeing colors beyond that.