pruning a juniper

Question

I have both upright and spreading, both well established

Answer 1

The most important thing to know is that juniper does not produce new leaves from bare wood. If you have bare spots, pruning will not change that. Pruning will prevent development of bare spots. Here is an article that discusses technique. https://www.gardeningknowhow.com/ornamental/shrubs/juniper/overgrown-juniper-pruning.htm