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Before you arrive at the right place make sure you find a good place to check your grooming and appearance. Make it in a systematic way: check everything from top to bottom. Then turn of your phone and under no circumstances are you allowed to wear unnecessary jewelry.
If at all possible visit a restroom before meeting your contact person at the employer's premises. You wouldn't want to sit through a very important interview with a bursting bladder being all you can think of. If needs be, stop off at a fast-food venue to make use of their facilities before the interview. If you are going to be waiting in a reception area for some time, ask the receptionist where the restroom is. Only do this if you are sure that the contact person won't be waiting for you or may even miss you while you're gone. It may be an idea to first ask where the restroom is and make use of it before contacting the person you have been told to ask for.