Making some forums "Members Only"

I would ideally like to have some forum sections/categories that are entirely visible to non-registered guests (so they can see what the community is like before joining), but I'd also like to have other "Members Only" sections where guests can only see the section headings and forum titles (not the actual content). Is this possible with xenForo? Has anyone here done it? Is it very hard to set up?
 
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