The shoe itself is fairly easy to shape as it's aluminum inside but the kevlar cuff tends to get in the way and the plastic coating makes it somewhat harder to get the shoe flat again while shaping it.
After about 20 shoes you'll find you can do this quickly and without getting covered in glue. The key to success is to have everything laid out within easy reach before you start work.
The other absolutely key requirement is to get the temperature of the glue right before you start. Too warm and it will set before you can get it all mixed into the kevlar, too cold and it will take longer to set and thus will be more likely to having the horse move it by twisting their hoof on the ground while it sets. If it's warm, put the glue in the fridge for a few hours before you start, it's easy to get it warmed up again.
SoundHorse is the supplier of these shoes. We used them for over a year on this horse and overall they worked very well. Initially they were quite hard to keep on for very long but with practice and much more thorough surface preparation they began to stick much better. After a year however the hooves really needed a break from the constant exposure to glue and he's now barefoot in the pasture.