How can I thieve a blood pressure exact?

OK. I'm in my first semester of Nursing school and Friday I have checkoffs(skills test) and I'm trying to grasp opinions on the easiest way to get the BP in +or- 4 mmHg? My problem is that I hear noise although my stethoscope isnt touching anything..I'm thinking that its the joints of my fingers cracking and I'm hearing through the stethoscope. Whats the best piece to do?
Answers:
If you want, you can do practice taking the blood pressure of the person and putting the stethoscope over the antecubital fossa. Then later on you will be able to determine the difference of the surroundings sound from the korotkoff sounds.

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