Hello
I recommend you have a strand test to see if 1; the hair is strong enough to take the change and 2; to see how light the hair will lift up.
It's easy to do, they just take a small sample of your hair and test on that.
I would always recommend you go to a salon for any colouring, as home dyes are easy to get wrong and can really damage your hair.
If you're in our area, we would be happy to perform a strand test and consultation for you, it costs nothing and you can decide if you want to go ahead with it.
Nikki
http://www.lockwoodhair.co.uk