You are going to breathe, in and out, and smile, even if through gritted teeth, and you are going to be solicitous, fetch and carry, offer more than he asks and you are going to enjoy the novelty of it.
Either that or he will drive you mad in less than one day. Personally, I'd go for the cheerfully suffering princess perfect, if I were you.
Best of luck. Let us know when your purgatory starts and we can keep an eye out and hold regular mini pity parties for you.... we all know you'll need it
And don't feel bad about dismissing it.... men are such whimps you can't be expected to recognise real suffering when you are confronted by it - honest!