I'm a British guy and seriously considering proposing to my girlfriend. The thing is, i've heard that things are a bit more complex than here... for example, i've heard that I need to buy *two* rings, which we both wear on our right hands, and then change onto the left at the marriage ceremony....and these are actually our wedding rings, there's no such thing as an engagement ring. So how does this all work? Do I need to buy the rings first, then get down on one knee, ask her to marry me while presenting her ring, then we both wear them? Or is it acceptable to just ask the lady to marry you, and then you go and choose the rings together (as long as she says yes of course!) Answers from Brazilian women are most welcome!