Do you know your blood pressure? If you do, tell them beforehand what you think it is. That way they might not have to pump the cuff way up so they’re sure of getting your systolic blood pressure (the first number) accurately.
To distract yourself, or learn, you can watch the pressure gauge or heat beat indicator gauge as the procedure is taking place.
The cuff will be inflated until there is no indication of heart beat in your arm. Then the cuff is slowly deflated. At the first indication of heat beating the systolic pressure is recorded. You should be able to feel your heart beat in your arm. The cuff continues to deflate until there is no indication of heart beat. The beating in your arm stops. That is your diastolic pressure. Try it and see how close you are.
If you make a game of it you’ll actually be looking forward to a BP test.
If the person administering the test does not know you or has no idea of your normal BP they will over inflate the cuff to a high number just to make sure it is above your systolic pressure so they don’t have to repeat the test. They might automatically pump all the way to 200 mm Hg for example. If you tell them ahead of time, they might show some mercy and just go a little above.