Oh Sus, when it comes to going blonde it really does pay to go to the professionals. most other colours can be attempted at home but blonde... I would never try it again.

Foil highlights sound like a great idea. Make sure you post a pic once it is done.

Ok.... Here is how it works Sus, you need to use a PERMANT colour if your hair is darker than the colour you want to put in. Semis will only work on hair that is lighter than the shade you are aiming for. Eg. If you are blonde, then going brunette or red is easy, If you have dark hair, you will need to use a permanent blonding cream to remove the colour from your hair first. I would suggest using a hair colour remover, you can get them from pharmacies etc and strip your colour first and then "fill" the colour with the tone of blonde you really want to be.
The only thing is, from personal experience I have been red and gone back to blonde lots of times and the hairdressers even freak out about doing it. Apparently the red pigment is really hard to get out and it make take a couple of times til you get blond blonde. Foils are probably the best eway to do it as you gradually lighten and lighten it.
Good luck....

It may take a bit to grab not sure why its doing whats its been doing though .Have a talk to a hair dresser she may be able to shed some light on the subject.I think you would look great a blonde.

I want to try blonde but am to scared to complety change. i will be doing it though when i reach my goal weight.
I hope it works out when you go to the hairdesser, hope you plan to post a pic of you