If you have someone "help" you back up by standing near the rear of the trailer, two things:
1) They need to stand where you can see them in the driver's side mirror... sometimes they need to stand pretty far off to the side.
2) They need to tell you where the rear of the trailer should go, NOT which way they think you should turn the truck!! It will get too confusing if they start trying to tell you which way to turn the truck - that is something you will learn.
Be patient. and practice.
Also, learn how to use your side mirrors, and learn what they are showing you. Best thing to practice this is to stop looking over your shoulder when just day to day driving around. Begin using your side mirrors all the time, on all your vehicles.
