Light colors are easy to get but the drk colors can be a bear. Might I suggest trying a Pressure cooker. It works but you will have to learn how long the hair sould be in and so on. You need to add vinager to the dye bath to. Be careful when using one of these. It dosen't take long to get the color needed.

I suggest buying the darker colors. It just isn't worth the hassle and it dosen't cost that much to start with. Ron