I can help with 3 and 4. Get safer's endall spray for the leafeaters. You can prune the rosebush back anytime you like. I would suggest giving it a bit of shape at the moment and then in the fall cutting it right back. Any offshoots you see that are a lighter greenish are suckers and can be cut right off at the base.
"For every animal that dies in a shelter, there is someone somewhere responsible for its death".