So as you well know by now, you have attended a few festivals, you should really do the following;
Drink plenty of water to prevent being touched in-appropriately by the barrier bouncers lifting you to safety ( i learn the hard way).
Sunscreen - unless you want to look like a lobster and peel like an orange then next week or die from cancer DO IT
Charge your phone - if you lose your gang how the hell do you find anyone when you have a flat battery
Looooose weight - no one likes a fatty in the mosh for the equivalent of one of you another two people could be standing on the barrier. Eat healthy
Shower - whilst all that jumping around will make you sweaty it is good hygiene to shower to prevent the buildup of stink you are emitting. we all know you love to mosh so your arms are going to be waving in the air like you just dont car, well Please do care, shower and deoderize coz your armpits are in peoples faces!
Remember your ticket - dont know if its my pals but on a few occasions we have driven 3 hours to a concert only to find oh shit my ticket is still on the kitchen bench, or oh crap that must have been that thing that blew out of the car at the servo. arghhhh idiot!
Last of all - devise something a skill perhaps incase of losing your pals (if your living in 100bc and dont have a phone) I over the years have perfected the whistle effective and can have a second use as wooing the bandies at how hot they are or how good the performance was. Another which one of my friends has recently let me in on is the bird could otherwise be called the ostrich i would love to share it but for it to remain effective to us i cant share im sorry.
So once you have all of these in check children you are ready to rock out with your wok out.
live it loud and live it proud.