How do go from brown and red to blonde?

O.k. I've got really long hair that has been colored a dark red with about 2 inches of a med brown new growth. I'm an esthetician so I have access to the professional beauty supply shops, so I purchased the Redken Blonde dimensions dust free conditioning lightener and the Redken equalizing conditioning color gloss in 09G vanilla creme. I also have 20, 30, and 40 developer. the women at the shop said to do 30 on my roots and 40 on the rest, I'm thinking this sounds correct but I really don't know how to play it all out for it to look good. Does anyone know how I should do this with out screwing it up. I'm scared I'm going to have a horror story to tell!!!

Becareful!!!! I did mine tonight and I had the same color a brown-red. Well I went to sallys and they gave me some anti bronzing stuff to add to the bleach and well Im a red-orange. But maybe you can help as to how long do I need to wait now to dye it or wil a blonde dye even work???If not can I bleach it agen??Thank You

http://www.blonde-ambition.co.uk/index.shtml - Here is a site for you, I read every category on the top row outlined in pink, I think it will help. From what I gathered from that site is maybe you didn't leave it on long enough.? I'm pretty sure all you have to wait it a day or two days at the most a week depending on the condition your hair is in, and then bleach it again this time it wont take long at all (so I read).