YAY, I'm so happy to hear that!!
1. Do you mean how do you wear it? Attach two straps of textile in the inside of the shoulder and strap it around your chest. (Is that clear...? Sorry, it's hard to explain things in another language).
2. I'm pretty skiny, so I try to do it not so tight....but that didn't go too well and the lower arm end up really tight xD I'd say it's pretty up to you.
Don't forget to send me pictures!