From experience, you can not really fake confidence. Confidence comes through success, but until then, you will need to imitate confidence which is kind of hard to do but just read up on how to do it. Basically, stand tall, lean back (never in) speak loudly, slowly and deeply, don't fidget or make lots of movements, and smile. If you imitate these things you will become successful and then you will have true confidence which, in my opinion, can never be imitated. Thats a note out of Style's Annihilation Method.
I just got real confidence over the weekend

Welcome aboard.
- Memento