I have dyed my hair from black to blonde twice,so here is my advice.You must go to A beauty SUPPLY STORE. Buy a bleach lightening kit. first,you will bleach the hair and it will look orangey. Then,you must use a haircolor to put on top of the orange hair. USE an ASH blonde as your color. ASH will rid your hair of the orange tones.See,it isnt really one step though,cuz the bleach merely lightens it,then you must put the color on top of it. my suggestion is a medium ash blonde color...if that still isnt light enough,wait a month and follow with a slightly lighter ash blonde.Good luck! It can be done...just get a good trim after,and use lots of conditoner,cuz hair will be dry afterwards.