Good advice Build 5, on a Agency job, I was allocated a place with a Plant firm and had a Generator on the back and the guy was trying to get me to reverse onto a busy main road. As I had never reversed a trailer of any kind, it turned into a nightmare 
.
I must have been there for 15 minutes (without getting out the yard) and ended up Jack-knifing the generator with a cracked tail light (even though I tried telling the guy I was hopeless).
Eventually took the generator off and just done a three point turn in the yard.
Put me off C&E that morning 
but when I was out collecting another generator that day, I practiced reversing without the time pressure (off getting onto the road and away) and picked it up.
Hopefully it will stand me in good stead for my C&E 