Makin' Pumpkins

I'm new to pumpkins, a bit of a pumpkin virgin, as it were  ... it was Margot's idea to grow some this year, it'll be a fun, she said, a bit of a laugh ... anyway through the cold of May nothing grew then in June a few leaves then turn July and  whoosh they filled the little plastic green house ... then tendrils? nobody told me about tendrils, nor the hairy almost spiky stems. Then the flower buds which were numerous but just sat there until yesterday when they turned a weird yellow then this morning I go down to find these ridiculous beauties ... but I read these are male flowers and these big bad boys need a female flower in order that things can progress, the technical term is 'fruit set' although you may call it something else ...  I'm told that the female flowers will definitely be along later but they only open early morning and close in the afternoon (bit like some shops I know) ... and hand pollination may be needed if the insects can't manage an early morning rendezvous ... and there, as it were, will go my pumpkin virginity.