Can I cut back a Holly tree?

I have two Holly trees next to my house. They are very large and I would like to cut them down to make them smaller, but I don't want to kill them. Can this be done?

Answers:
yes you can, I worked at a nursery and cut a whole greenhouse one day (im talking over 1000). They will grow back.

Other answers:
just dont eat them
just dont eat them
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