You have to double clutch. Remember one of the things you must do is have power to the drives at all times, especially when crossing a set of railroad track. If shifting is too hard for you, you gots to learn it. Up until she pulls ### off clutch in three heartbeats you should already be in the next gear up. Clutch out. Add power.
Do NOT wuss out and get a automatic truck. It will stamp your CDL a restriction against manual transmisson and you will have a hell of a time hiring on to employers in the future.
Finally but not last, if your tester is scoring 100 points, a scratch or mistake on a shift is not the end of world. Just don't ever have her in reverse at the light before you take off. That happened to me and minus two points.
This is not related specifically to Tennessee but generally speaking.