Don't be afraid to hang your head out the door either, especially at an angle.
Pop used to back 53' boxes up the driveway that was just barely wide enough for a 102 box. He'd angle the trailer's ass towards the driveway, open the door, stick his head out, and follow the trailer into the driveway. Once the rig was straight, he'd shut the door, and follow it the rest of the way with his mirrors. I use this technique every time I need to angle the 23' dovetail into place.
After driving truck for 25 years, though, he backed up more miles than a lot a people go forward.