Hi!

All I want to comment on is that you should keep that tree outdoors year round, Junipers need the cold.

There is no substitute for an understanding of how plants work, and a sense of how to best work with their natural rhythms, instead of having their natural rhythms working against you. What you can/can't do, how much you can cut off, and how much stress you can safely subject a tree to depends on a number of factors. The trees species, its state of vitality and whether or not it's declining or building strength, the amount of genetic vigor the species is endowed with, where the tree is in its growth cycle, how long it's been since other work that might factor into what you intend to do has been completed .......

Work that might be taken in stride by a healthy tree might be fatal to a tree in steep decline. Some trees can be reduced from 6-10 ft tall to a 1" stump with no branches, others balk at having a significant % of its mass removed at one sitting.

How about posting a picture of your tree?

Al