Tame that yarn tail when you are casting on or changing colors.
Put a little extra weight on the tail with a clothespin or clip of some sort. Not only will the initial cast on row be neater, the first few stitches of the next few rows will form properly, making seaming easier.
Any clip will work, (binder clips from the office supply will work in a pinch), but I like chip clips that are coated with a rubber type material. They hold the yarn firmly.
Whatever type of clip you use, store it around the base of your mast for easy access.