I would highly suggest that you get a couple short orange soccer cones for like $3 each and pull into the first vacant parking lot, church, factory, business, whatever, set up the cones and practice with the trailer for an hour before going out onto the roads. You'll get a feel for backing up, turning radius, etc. Get up some speed and brake hard so you'll know how it feels. All things you will probably feel more comfortable learning in the safety of a parking lot rather than on the open road or if you get into a tough spot while getting gas or something.
That's a great suggestion
I've done the same thing with boats that I haven't handled before, or just for practice. Set out a couple of buoys and practice maneuvering without any million dollar yachts or hard concrete docks to hit. In that case it's "rubber docking."
Also, when I was a new driver in Minnesota, as a youngster, we would go out and practice in snow/ice covered parking lots, to get a feel for driving on slippery roads.
Definitely a good plan!