I would say don't do it all at one time.
Get hightlights and gradually start adding more so it is also not as much of a culture shock.
you could bleach your hair then die it blonde. ive did that b4. im naturally blonde but i wanted to die my hair DARK brown and i hated it on me so i bleached my hair then died to blonde again. it worked! or like they said you could go to a hair salon! Bleaching your hair really fries it!Does brown hair go ginger if you dye it blonde?
go to a salon to get it done their professionals they know what they're doingHow can I dye my blonde hair brown without a green tint?