Don't worry, the cold shock only hurts for a min.
Just kidding of course; it's really not that bad and you'll have a blast. (Provided your exposure protection is adequate, like Bbianchi mentioned)
Self admitted serious WWW!! 8mm's in the mail if it doesn;t fit - then on to dry suit before I ever get wet !! Whelp not exactly but soon after
Thanks for the great welcome - look forward to saying hello!!!