I have mine on Monday.
I just asked my sister what she had to do, she said yeh you drink the stuff and have to wait an hour or so.. joy.. that will be fun.. an hour in the waiting room! Are you allowed to go to the bathroom in that hour?
She said she didnt have to fast or anything. But she had a scon with jam on it before hand and the jam made her sugar levels look really high and she had to go back and do another.. so if you do eat before hand, make sure its nothing sweet!