Like most skills in life you learn the most from mistakes. After you have knocked over a few gas station pumps, crushed a few bicyclists, taken out a few power lines and bashed in a car door or two you will begin to feel like a pro. :)
Seriously though watch your trailers wheels in the mirrors and do not hesitate to stop in traffic and back up if necessary. Better a few honking horns than a damaging encounter with a post or curb.
Sometimes you will need to swing into the on coming traffic lane at a right turn to avoid that wheel chair person or bicycle waiting at the corner.