With such long and thick hair I really donít feel its professional of me to advise you to do it yourself, Iím sorry. I would go to a salon and have multi tonal highlights and gradually work towards the lighter colour you desire. This way you wonít do too much damage and you will also get a more even result as you will have colour build up from the black which will be hard to remove evenly. ...More >
You can maintain and make subtle changes to the colour with toners and colour conditioners through the process.