nAON, I'm not sure about anxiety but the dose for hypertension/angina/heart failure is more in the region of 100-450mgs. I don't think it is licensed for anxiety but it is prescribed off-label sometimes.. not sure about the dose.
I would recommend trying it out beforehand to make sure it agrees with you and work out the best dose. Side-effects-wise it can lower BP (obv) so you might feel dizzy or light-headed.. it's a selective beta-1 antagonist so it shouldn't have too many other side effects (although a quick look on drugs.com reveals it can also cause diarrhoea, drowsiness, headache, reduced blood flow to the hands and feet due to reduced cardiac output and various other things - most of which will be pretty rare).
Good luck in your interviews!