I would not. I have successfully used demi colors to darken my hair back to my regular color once I am done with a look. and when I was younger I was able to do vibrant colors. but a blonde itself or natural shades I would say is a bad idea because it is more difficult to achieve the shade you want. A professional eye will be able to achieve it (hopefully) and some people even have issues with professionals achieving certain hair colors because some hair simply will not pull or is inconsistent in color (especially if you have had color done before). Just wait it out and go to a professional. I am not a professional nor do I work at a salon, so I have no motivation to really say this other than trying to help you out and say its not the best idea.