You are on your own now but the examiners are not ogres. Really, they aren't. Your examiner will introduce themselves and they are trained to be customer friendly. They will realise that you are nervous, most people are.
The best way to cope with the test is to work one hundred percent on the procedures that you have been taught from the very beginning through to the very end. Right from the time that you are asked to start the engine through to when the examiner asks you to pull up in front of the test centre again and turn it off.
This might seem too obvious for words when you first read it but with the benefit of experience I can tell you that people have in the past relaxed part way through the test because they thought that they had done something wrong. This was not the case and they failed because of errors that they made after they stopped working one hundred percent.