My first time skydiving i am so nervous?

so its about to be my first time skydiving in two months date is set good to go, as excited as i was before i made the date i am now nervous, im sure ill come out alright, im not really scared of heights, i dont mind standing on houses, ferris wheels and so on, but i guess the fact of the fall is just what scares me, any advice to calm the mind before the jump? calm heart pounding so on and so fourth?