I do my own but don't use a highlightening kit. I choose the shade I want all over and then pick a shade either one to 3 shades lighter to highlight with. Remember only permanent color will lighten your hair.
I pull mine through a cap. If you want drastic high lights you have to bleach it out and then add a toner on top after its bleached. I foil my daughters but can't do my own...its easier to just pull it through the cap. I have heard some people say they have had good luck with the loreal with the color and highlight in one kit...can't think of the name right now.
Marti