Why don't you do it now, repot & first prune?
Looks to like you should have moist warm weather, ideal for repotting a juniper.
Maybe, just to be sure, do you have a picture of the plant you are talking about?
Many of the how-to guides recommend pruning and repotting only in Spring or maybe Autumn. Summer isn't typically recommended since trees can enter a state of semi-dormancy in the heat of Summer. I was pretty sure a juniper could handle it well even now, but I wanted to check in case anyone would say, "Oh, no - I tried to repot a juniper in the Summer and it died!"
I've attached a couple of photos, per your request. The close-up show what I'm currently thinking will be the front.