Try to stay opposite the table, and have a talk with the table people before the game, and ask 'em to keep an eye on the sideline for you. Sometimes, they can be useful for OOB situations, and that way you don't have to use the arrow so much.
That, and stick to your guns. You're (obviously) going to miss quite a bit of "stuff," so don't let either coach intimidate you. If you talk with the coaches before the game and they're OK with you working alone, the have to expect that you'll miss a call or two.....or three....or four....
