This ideal of love is all about this person wanting someone to do this for them, not about them doing it for someone else and then giving advice. If someone did this for them, and it wasn't the right person, they'd turn them down just the same as ever.
Don't listen to this crap. Yeah, you should tell someone you care. The rejection is better than the "what if" later. However, doing some crazy thing isn't going to get you love. It might get infatuation, if they like that kind of thing, you're hot, and they are lost in the "where is my prince" phase of thinking. But that infatuation burns off as soon as you aren't doing crazy shit for them every day.
Boys, just try, be yourself, and don't invest too much until you know it's solid.
Girls, just frickin marry your best friend, it's the best move you can make, the other guys may be hot, but hot only lasts so long, when you're 80 you both look like crap, are you going to care about how hot he was? no.