Mike has it right. take a wide turn so you have the best hopes to get your trailer as lined up as possible. Best thing to do is practice, practice, practice and take it slow. You are not in a race. The more you drive with your trailer the better feel you have on were your turn points will be.

Now remember you can do everything right and have the trailer in the perfect position to back out and idiot to your right can mess everything up and be so jacked up and blocking your trailer that you have to unhook it from the truck and push the trailer out then back the truck out.