Kinou,
Welcome! I have have no tips to share as I've never been fitted with one of these ambulatory monitors. Because of the cost, ambulatory blood pressure monitoring is not routinely used here.
I have an idea. Since you are a teacher, why not share this with your class? You could give a short lesson about blood pressure. Depending on the age of your students, you could even show them the monitor. Younger kids would find it fascinating. There are photos of this device in a couple of my books. It is not really that big. I don't know how much noise it makes when it self-inflates. I don't think it's as noisy as the ones they use in hospitals.
I hope someone who's worn one will respond to your post with a few helpful tips.
Good luck.

Please let us know about your experience.
flowergirl