[JJ]

When I started umping 30 years ago I worked the box, or GD, if you will. I switched to the scissors about 15 years ago after getting rocked a few times too often one season - I needed something to "lock me in" better, and the scissors fit the bill. This year I switched back to the GD because it was easier on my hip, but I switched back to the scissors for my final two weekends of the year - a conference tournament and a Regional. It was like riding a bicycle. Next year I hope to go back to the GD and work hard at it to make it as automatic as the scissors for me. There is no "right way" - there's only a "right way for you". Keep working at it until you get comfortable.
Oh, the six umpires in my Regional were split 3-3 with scissors and box.
JJ