Nooo!
Hi Hannah,
Do not just put this brown straight on your hair, if you do there is an almost certainty it will go green! If you really cant afford to get it done professionally (which to be honest is always the best thing to do when you need a colour correction) i would advise to buy a slightly reddish brown (and i mean slighly red so you dont end up like a traffic light) like a light brown mahogany colour on it, try and get base brown colour as close to your natural brown as you can, i know you said you want it lighter than your roots but you cant achieve that on your own when colour correcting, you will have to go back to your natural brown then once your there wait a few weeks then see about lightning it all together,without looking at your hair its very difficult to fully advise but this is what i would do as you need to put the red tones back in your blonde hair to make it go brown (this stops the green tinge) after that if its a bit to red for your liking, You can then put a flat brown on it if you need to, safely. It does mean a lot of messing about and prob a bit of colour overload but short of going to a professional i think its your only option and buying 2 colours from a shop would be cheaper. To achieve the light brown you wanted, a hairdresser would use 2 maybe even 3 different colours and peroxide strengths on your hair to lighten and darken certain areas depending on how dark your natural brown is and how light/ginger the rest of your hair us. i would strongly advise against trying this yourself or you could end up in a real mess. Hope this helps, please let me know how you get on 
Thanks
H x
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