Practice.....
It's one of those things where you feel like all thumbs until you get a routine down with them.
When you figure it out, let me know.

Seriously probably the best way would be with 2 people and someone hooking each step to a pull cord as you go up. Set one, climb up lean out and have the person on the ground hook up the next one for you to pull up.
They're easy to set just kinda clanky and clumsy to try to do by yourself in one shot.