The first and most important thing to remember is when you’re reversing, the trailer will turn the opposite way to the way you’ve turned the steering wheel. So left is right, right is left and black is white, if you’re making contemplative assessments about the world we live in.
The trailer will also turn more sharply if you apply more steering lock. So, take things calmly and slowly. Imagine if an episode of Countryfile could drive and then try to mimic that. No need for a gilet, though.