Dying my hair plum-burgundy...help! =D?

So...I haven't dyed my hair in like seven months, and I have like five or six inches of black root, and the rest of my hair is a brown bry color. I wanna dye the top of my hair at home...what should I do? Do you think it will come out good if I just dye it like I normally would? Or would I need to do something specific?