How can you go from gingery brown to blonde?

You will need to apply an ash blonde with green undertones, no more than 2 shades lighter than your hair is now. The ash will counteract and red or orange during the lightening process, then, apply highlights with to achieve a light blonde color. If they turn out too yellow you will need your hairdresser to put on a blue based toner or demi permanent color. Your best bet is to get a hairdresser to do this for you though. Good luck!