help

So my hair is currently three colors. my roots, which are light brown. and the rest is an ombre from black to blue/green. i dont have the money to go get it done professionally so i need to know what to do myself. i want to get rid of it all and go an auburn/burgundy color. i was thinking of bleaching the black then once that is covered bleach the green/blue and leaving my roots. then dying the blonde color a light brown, then to my final auburnish color. anyone have any better ideas or tips for me?