Some botanicals give a decent yield of EO, and maybe your junipers are one of those. A good yield is often 1-2%, but many plants have a much lower yield than that (and some don't yield EO at all). Even with the best plants, you have to distill a LOT of botanical material for every drop of EO.
For example, if you need 1 oz (about 30 grams) of EO for a batch of soap based on 1 pound (500 g) of fats, and the plant you're distilling yields 1% EO by weight, you'd have to distill 100 times that -- 3000 grams or 6-7 pounds -- to get that much EO. Not saying it can't be done, just that it takes a fair amount dedication, time, plant material, and fuel to get there.
IMO, small scale distillation is better suited to making hydrosols than EOs. A person can produce enough hydrosol in one batch to be useful. And hydrosols can be made from plants that don't produce any EO.