Usual recommended way with the beetles is to squish them. When they fall off the plant they go upside down and are hard to see so some people put paper underneath to catch them. Be aware that they are liable to fly off if you aren't quick enough! Sorry can't help with the tree lilies, but usually the best time to move lilies is when they have died back but while there is still some dead stem to show where they are.

Moving them after the first frost has killed back the top growth is fine. They will not grow as much next year as they take 2-5 years to get to 6ft+ and need the root system to do that and anchor.

Thank you steragram and kildermorie for your help and advice.
notacluemick. (but I am learning1)