in all honesty, with something like that i would just go to a salon. its like hair coloring, they know what they are doing. you can either fry your hair or at the least, it won't work at all. gl
i wasn't telling you not too, i am not a hair sylist or anything so i know i wouldn't do it on me. but if you feel comfortable go for it. i know that when i had my hair straightened, it did lighten up a little, but not too much.