If your highlights are lighter than you wanted them ... apply a toner or colored gloss on top of your highlights to tone them down. Choose a semi or demi-permanent color (try Wella Demi Permanent Hair Color, $6.79) and apply it directly to the highlighted areas. Follow the time guidelines provided on the box, but again, check the color as it processes to make sure it's what you want.

If your highlights aren't light enough... wait two days and then re-do them. To ensure you don't go too light, only re-highlight 1/2 of the sections you lightened previously.

If you're highlights look orange... it's likely the product you used isn't potent enough to lighten your hair (or you didn't leave the bleach on long enough). Instead of taking matters into your own hands, call your stylist (or a color company's help line) and tell them what you used and what the problem is. They will be able to help you with your specific issue.

Generally the easiest way to fix color you don't like is to find a semi or demi-permanent hair color, like Clairol Natural Instincts, $6.99, that matches your natural base color exactly, O'Connor says. Color all of your hair to help it all blend together. Then wait a month before you do any more color, or see a professional.

If you've been highlighting or coloring your hair for a while and you want to warm up or slightly tweak your overall color, try this: After adding highlights, when hair has been washed and dried, put your favorite all-over hair color on top. The highlights will peek through but your base color will get a nice boost.

Image via Imaxtree