Well I agree with the first one u never no what's gonna happen the worst that ends up happening is they don't feel the same way but then you'll move on but once they no u like them they could develop feelings for u almost:) go for it
Most times I would say to go for it , what do you have to lose ? But I've experienced this & I can tell you it might not be worth it . Hearts will be broken , tears will be shed . Your head already knows the other person 's answer ; now just force your heart to know it too . Good luck .