I learned backing trailers the hard way....bought one and figured it out.
Goosenecks swing a little differently, but are infinitely more maneuverable than a bumper pull.
Go buy a toy version of your rig, and sit on the floor and play with it, pretending you're driving it.
Watch what the trailer does when you make different maneuvers, both sharp and gentle.
It will help you get a feel for where things need to be when you set yourself up to back it into place.
It is possible to park between 2 trailers with 1' on each side of yours, making only 3 moves, and hit it from a 90* angle.
Knowing your mirrors, knowing your truck, and knowing your trailer are important.
Practice is the only way to get better.
Having a decent coach is also a bonus.
If you come to AZ with your trailer, i'll show you how to do it, and hit it spot on every time. Then i'll teach you how to read your rig and set yourself up for success every time!