Q. What about the left over tail on the other side?
A. When you start and end a color in crocheting, there will always be a "tail". You get rid of this "tail" by using your crochet hook. After you have cut your yarn off, and slipped it through your last loop on your hook, you trim the tail to about 3 inches. Then simply use your hook to thread it back into the same color as the tail is.