okay i don't know about other salons, but where i work you get into a booth.
what happens is you fully undress..
put a hairnet type thing on your head (i usually double up because i'm anal), goggles for your eyes if you want, and booties on your feet if you want (all should be provided for you at the salon already).
you also have to put a barrier cream on your hands, elbows, knees and feet (if booties aren't worn).
once that is all finished... you step in the booth facing forward and it will spray you up and down 12 times (i've counted haha). it should then stop and then you turn around so it can spray your backside up and down 12 times as well.
after you're all finished, you step out and dry off like you've just gotten out of the shower. just blot your face and neck though.
you MUST wait 4-6 hours before doing ANYTHING involving water. (that means showering, swimming, washing dishes, sweating, etc.)
once 4 hours at the minimum is up, you can do your everyday activities.
the tan should last from 4-7 days.
SOME blotchiness may occur, but you'll be in disney getting even more of a tan! it will even out anyway!
hope this helps some!