Don't sweat it mate. Classes are intimidating at first as you expect everyone so be this super hard fighter...in reality there will be a lot of new people too. Most Classes should generally be run in a friendly 'we're all going in the same direction lets help each other' sort of mentality. If theres a really strong competition between students (one man journey etc) then I'd be dubious as it doesn't reflect well on the school.

But you'll be fine. Don't worry about the weight, you'll sweat that out in the first week lol

good luck

let us know how it goes

Craig