Excellent!
A new job, a new you.
Advice:
Try not to think too much about it. It's never as bad as it appears.
Most people will be really nervous about meeting you, training you etc so just remember that.
Keep your thoughts to a bare minimum during the day, you may have the tendency to over anyalise how you are 'performing' or what others think about you, this of course is out of your control, so just let it be.
If your heart starts to race, this is a sign that your inner voice is saying to you "its all good, you are still alive, so feel the adrenaline, feel the rush"
Have fun, let us know how you get on.
Jack