Spells are only as strong as your belief in them and your ability to make your will possible. The most powerful of spell casters do not use any tools such as rose petals, dances, or chants, because these things are not really required.
Unfortunately I don't know much about love magick except that many people say it could easily backfire. I do know that I would rather get the person I like to like me back without magick since if I use magick she may not like me for who I am and that means the love isn't really there. At least not in the way I would want it to be. She'd be more likely to love my looks(lol), my wallet(lol again), or something else(not mentioning).