Hi, and WELCOME!!!
Something to bear in mind on (or even leading up to) your B-day is that the psychological effect we can have on ourselves is often more profound than the actual experience itself. What I'm trying to say is just relax and enjoy the journey (on my b-day I was so worked up by the time it was done, my hands were shaking. I'm not sure if this was due to my lifelong fear of dentists, or because the decision to get my teeth sorted after so many years became such a huge deal in my mind).
Another thing is the way you perceive the brackets as being massive (especially if you close your mouth over the brackets before the archwire is installed), they're not really so big, and you'll get used to them soon enough. Also expect your teeth to feel strangely "tight" after a few hours, the awareness of this "tight" feeling passes in time. Expect your teeth to start feeling tender/sore (not unbearably sore mind you) by the day after getting braced, this too passes in time, so don't panic that your gonna have this pain hanging around for the duration of treatment.
It's usually a good idea to ask your ortho what to do if you get a bracket that comes loose, or a pokey wire etc (for example should you make an appointment to get it sorted or will they accommodate you if you just arrive at the practice).
Like LadyJ said check out the main Archwired site for "First days in braces" it's really helpful and informative.
Good luck with your treatment
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