If possible approach with parking space on drivers side.
When approaching, hug side of road that space is on. When trailer tires are even with leading edge of parking space turn away from space and when truck is at 45 degree turn back other way until truck parallel.
This will set the back end of trailer at roughly 45 degree to parking space.
Slowly begin backing up watching trailer tires. Wait for it...5'vr are slower to respond then quickly catchup. Back rig in watching where the trailer tires are going.
Spotters....watch front of truck.