How do you beat the fist colossus in shadow of the colossus

Oh man! you cant.......oh leave that. You see hair on his legs, climb their and do two stab attacks! when he falls, you will see hair on butts climb the butts, you will see places where you can sit, climb and sit their to regain your stamina then you will see here on his upper part, climb, you will see a blue tattoo like thing (only when you have your sword) Stab on to it many times and see what happen.........