hey Kolossi,
No i didn't buy the bracelet, to be honest i just ate a banana or two about an hour and a half before each flight and dressed in light clothes and the most important IMHO a big blast of fresh air into the face. In my first lesson the sweat was rolling down my face (Nice i know) so the air helps me big time.
I'm still doing climing and desending and the irish weather is not helping me out.