Tapestry Crochet

Has done a probject using tapestry crochet or something similar? I am trying to do an afghan with one background color and a design in a contrasting color. The pattern isn't too hard to read, and I have figured out carrying the contrasting yarn under the main color but am wondering how to make the changes of color "neat". I have a bleed-over problem when I pick up and drop off the design color. It's only about 1/2 of a stitch, but it's driving me crazy (unless it's supposed to do that, in which case, I'm doing really well). I found an online video through You Tube, but her design is so small and it's not an up close video, so I can't tell if her stitches are doing that. Just wondering if anyone has any ideas.