"Swipe a thin layer of petroleum jelly or rich moisturizer on the outermost edge of your hairline," Backe says. This provides a barrier to keep the dye from staining skin. Just make sure you don't get any on your roots or your color application may look uneven or splotchy. If you do stain your skin, pick up a bottle of Roux Clean Touch Haircolor Stain Remover to easily remove it.

"Hair color can feel tingly and uncomfortable if your scalp is too clean," Slattery says. So always apply hair color to unwashed hair. The natural oils act as a buffer to the product. And don't worry; color is strong enough to penetrate through hairstyling products, no problem!

Coloring thick and/or long hair can be time consuming, but try not to get frustrated and skip strands. Slattery suggests dividing hair into four or five sections to make it more manageable. "Let a portion of hair down, color it, then pin it up and out of the way while you work on another section," she says.

Grown-out highlights may be trendy, but single process re-growth isn't because it looks too severe. Color your roots at home every four weeks (even if you have salon highlights). "Only apply [color] to the half-inch of new growth, Root Touch-Up by Nice and Easy has just enough product in the box to color through your part and around your hairline," Backe says.

Whether you've colored your hair at home before or not -- read the directions carefully. "If the box says run the color through the ends for five minutes, don't do it for longer. Your ends could wind up two shades darker than your roots because they are more porous," Pemouli� says. And we all know the trend is the opposite -- dark roots with light ends. As Whitney Port of "The City" proves here.