Best hair color shade for light brown to blonde?

My hair is naturally light, light brown and I have light blonde highlights more on the top of my hair, underneath it is darker. I want to color it all a lighter blonde shade and am afraid of the orange, brassy tones. I bought an ultra natural blonde shade (loreal) and am wondering if this will lighten up the underneath brown and even it out or do I need to go to a salon?Best hair color shade for light brown to blonde?
it should be fine. Hair only goes all brassy if your trying to really BLEACH out dark hair. If it has a slightly yellowish tinge you can get a shampoo with a purple tint that will remove the yellowness. It would be very expensive to get it done at a salon. Your hair sounds like it will be easy to deal with so don't waste your money on something that you can do at home.