You stick at it girl.
He wouldn't let you even attempt it if you wern't good enough (and prob a wee bit to spare)
To be honest if he is anything like myself he will be more nervous than you. He knows you know your !!!!. He knows you are fit for it. But you could bollocks it up on the day due to being a fanny.
Take a few quid extra along and get your bloke to drive him home afterwards.
MJ
PS don't mention doing an IMC on the day give him a couple of day of grace before you land that one on him.