nothing much more to be done - other than wait.
Give them decent sun, make sure they don’t fully dry out and don’t repot, don’t trim roots or foliage, don’t fertilize.
I don't understand this advise quoted above.
Yes, check on these junipers daily. Don't just wait.
Yes, junipers need at least half day of sun or more. When healthy, they are generally "full sun" trees. Sunlight can be partially dappled, but should be closer to full sun than to half shade.
Yes, water them to prevent drying out. They want to be wetter than barely moist. They generally never like to be in standing water for more than a few hours. A moisture meter can be misleading, more reliable is inserting your own finger at least as deep as your burying your fingernail to the quick. If it feels cool and moist, no need to water. If it feels warm or dry. Time to water. Notice heft of the pot. A dry pot will be light compared to the wet pot. After you have a few wet to near dry cycles of experience, just by noticing the heft of the pot you will know if the pot needs water. Water immediately, don't wait. If soil drains well, natural rain cycles, like a 4 day episode of rainy days, generally will not cause any problems. Do not have the tree in a tray that collects water during rain episodes. Just let it drain naturally during rainy episodes and it will be fine, Similar with snow if snow is expected to melt within a few days of falling.
More trees have been killed by moisture meters than by those who use the human finger to determine soil moisture. Almost without exception, experienced bonsai growers do no use moisture meters, they are a waste of money. If you can return it, do so..
Junipers do not like their roots being disturbed more than once every 5 years or so. Once in an inorganic mix, you only need to repot when aesthetics require a repot, preferably with at least 5 years or more between repotting efforts. I had a juniper in pumice that did not get repotted for 15 years at a stretch. So do not repot your juniper unless absolutely necessary, either for health of tree or for an aesthetic change of pot. Both should be planned ahead. I believe it is too late in the year for your area for repotting. But others who live near you should advise.
Your foliage looks "burned" at the tips, don't do any pruning this year. You can always prune a little more next year. Just let it grow this year.
Fertilizer. I would give a dilute dose of fertilizer, later this summer, any liquid fertilizer will do, but use it at a dilute concentration. If the label calls for 15 milliliters, use no more than 5 milliliters. In other words 1/3 to 1/4 strength. Keep it dilute. Similarly if you use cake type fertilizers only add about a quarter of what the label recommends for this year. I'd fertilize around 4th of July and once again around beginning of August. Then call it quits for this year. Next year you can start with a late spring dose and then dose once every month. but only if new growth looks normal. If you still have a lot of burned foliage hold off on fertilizer.
