More or less yes, minus the copying files back if the operation was successful. You must be careful shrinking partitions as it is very easy to destroy them, and I'd have to guess the partition layout looks vaguely (EFI System Partition (/boot/efi), Boot (/boot), Root (/), ...), which would require shrink and move of the partition before or after /boot. If you're unfamiliar with shrinking a partition, a bit of reading into how it is done for your filesystem will be required. Different setups, ext4, btrfs, lvm, LUKS, etc. will have different requirements.
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