By knowing the regulation and putting together the best case possible and being honest, humble, and professional you stand a good chance of coming of the Article 15 process with light punishment and/or a bruised ego.
Trust me on this I have been in many Article 15 hearings so I know what I am talking about.
I am sure most of this post is not what you wanted to hear, but I can assure you by using this information to your advantage you will most likely come out of this situation better off than if you choose not to use it. After this process is over do not take the Article 15 personally. Understand that you need to pay the price for your mistake (if you did it) and commit yourself to being the best Soldier possible. If you do this with a good attitude your chain of command will see it. It is hard to keep a good Soldier down. Learn from this incident and never allow yourself to be in this situation again. When you become a leader help your Soldiers learn from your wisdom so hopefully they will not have to learn the hard way.