Is it safe to `chgrp` of home folder from 'staff'?

I want to be able to share items from my home folder with another testing user account on the same machine.

By default, the group of nearly all items in ~ is staff ... of which the only member is root.

Can I safely chgrp -R admin ~ and chmod -R g+rwx ~ ? Or will this have negative consequences?

(Many of the items I want to 'share' are in ~/Library so I cannot simply put stuff in /Users/Shared)