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Junipers do not poison the soil in the sense that black walnut does. However, a mature plant has very dense shallow roots that make it difficult to plant all but the most drought tolerant plants nearby. Roots typically extend beyond the "drip line" by 50%. Blue Point juniper may grow to 8 feet wide which means its roots may extend 6 feet from the trunk. Planting azalea or hydrangea within that 6 foot span may yield disappointing results as the juniper roots grow. They should be fine if planted outside the juniper's root zone. Junipers look the best in full sun. They tolerate different soils and pH well except for soils that don't drain well. Hydrangea and azalea both like consistently moist soil and morning sun or indirect light. (Endless Summer and similar hybrid hydrangea take more sun.)

If I had to guess (and if this was not planted with specifically acidic soil) then it is probably not getting nitrogen due to high soil pH.

Alternatively, this can happen with too much sun, as well. They are better suited for shade.

Here is an article that will help you to care for the shrub:

https://www.gardeningknowhow.com/ornamental/shrubs/azalea/azaleas-noteworthy-shrubs-for-any-garden.htm

As long as the leaves and ground directly around the tree are dry before you do this, then yes. If there is any moisture, it may lead to rot. This would not be good. Chopping them up finely can help avoid this, as well. Overall, I would not advise it, but if you follow those two rules then it can be just fine.

Here is an article to help you with their winter care:

https://www.gardeningknowhow.com/ornamental/shrubs/azalea/winter-protection-for-azaleas.htm

The size depends on the type. If you know what types you have, then you can search the type with Google, and it will tell you everything that you could want to know about the cultivar that you have.

Unfortunately, their sizes vary widely so it will be hard to say. You could try contacting the nursery that you bought them from. They will know the sizes of their cultivars.

after its done blooming in the fall trim it back with hedge trimmers. you can take about 1/3 of the plant off and shape it. like you want. Then in early spring you can trim it again before or just when the leaves start coming out. Then give it fertilizer and mix in bone meal. your flowers will be great next year.

We have just the article to help!

https://www.gardeningknowhow.com/ornamental/shrubs/azalea/propagating-azalea-cuttings.htm