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We would recommend following the directions found in this article on killing trees: https://www.gardeningknowhow.com/ornamental/trees/tgen/how-to-kill-a-tree-killing-trees-in-your-garden.htm

The same principles apply to killing shrubs as they do to killing trees. You could also try aggressive pruning on the bushes that are too big. It will either kill the shrub or return it to a manageable size, which either way will accomplish what you needed.

Yes, you can do that. Just try to get as much of the rootball as possible.

To alleviate over fertilization and the excess salt buildup this causes, simply place the plant, if it's in a container, in the sink or other suitable location and thoroughly flush it out with water, repeating as needed (3-4 times). Outdoor garden plants can be flushed with a hose.

Remember to allow the plant to drain well in between watering intervals.

Unless you live in a very warm climate, you'll have to bring them indoors for winter, though some hardy fuchsia varieties are available. In addition, the stems cannot be forced upward, as their normal growing characteristic is somewhat trailing, which is why these are common plants for hanging baskets. For more information on growing and caring for fuchsia plants, these articles should help: https://www.gardeningknowhow.com/ornamental/flowers/fuchsia/growing-fuchsia-flower.htm
https://www.gardeningknowhow.com/ornamental/flowers/fuchsia/fuchsia-winter-care.htm

It is either a lack of water or a lack of nutrients. Make sure they are getting enough water and that you are fertilizing regularly.

It could be from a lack of water, a pest issue, or fungus. Increase the watering if the plants feel dry. Check for insects. If you find no signs of pests, it could be due to a fungus of some sort (of which there are many). Treat them with fungicide, like neem oil, and see if this helps any. Neem oil will take care of both any insect problem ans fungal issue the plants may be having.