Because of their vining and detailed nature, these trees can take more time than others. I always check the health of the plant first and the environment it is so I cultivate health in the tree and optimal flow with its surroundings. This practice is incredibly detailed work and calls for an experienced eye. Fun fact about Japanese pruning - birds love to perch in pruned trees! Most people think they would want to sit in a bushy unpruned tree since its safer, but I have seen the opposite! It makes for a beautiful picture, or should I say, bird furniture. :)