What should I do to avoid shaking?

I have a crush on this kid at school. I really like him. On the last day of school, he told me he liked me too. we don't speak much. We used to speak to each other like friends, but ever since my "friend" humiliated me on the bus in front of him, making jokes about how we should sit together and what not, I just find it so awkward to speak to him. For goodness sakes, I hesitate to even make I contact now! But anyways, he likes me a bit. yesterday, I saw him at his dad's music store. I could feel my legs shaking. He was outside the shop chilling, and while I was inside, picking stuff up, I could feel my hands, and see my hands shaking. I'm 12, and don't want to look like a shaking fool. Could someone provide me with any tips on how to avoid shaking and having other acts the imply I'm nervous around him? Or be nervous in general? Any answer I appreciate. Please do not leave " Don't be nervous" because the whole purpose of this question is to receive tips on how not to look nervous, or be nervous. Thanks :D