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Misting to increase humidity doesn't really work, unless the misting is done every 15 minutes, like they do it in commercial greenhouses. This article will give you some ideas about increasing humidity: https://www.gardeningknowhow.com/houseplants/hpgen/raise-humidity-for-houseplants.htm

They will grow in nearly any type of container, so long as suitable drainage is provided. That said, it also depends on whether you are planning to hang it or leave it free standing. Whatever you choose, just ensure that it is large enough to accommodate the size of your plant and provides adequate drainage. For more information on caring for these plants, this article will help: https://www.gardeningknowhow.com/houseplants/boston-fern/boston-fern-care.htm

You can prune them back to the ground when they are planted in the ground. They will grow back from the roots a bit more manageable size.

While some leaf shedding is normal, you may want to check the mositure. Boston ferns like to be kept moist, especially in hanging baskets where they tend to dry out more easily. Also, you may want to increase its humidity by misting the plant daily.

Yes, you can snip them off if you want without harming the plant. You may also use these to propagate new plants, if desired.

It would be better to provide these plants with a bright, shady location that does not receive direct sunlight, as this could scorch them.