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...think through the process before embarking.
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Truly.
The root partition can only be safely moved or manipulated when running the ramdisk kernel, or booting a copy of the OS from an alternative drive, such as a USB stick. Bootblocks will need to be reinstalled, and the specifics will vary depending on architecture. For i386 and amd64, installboot(8) is used.
When the ramdisk kernel is used, it is limited to static-linked utilities already included in the environment or copied to its very small amount of free space.
Single-user mode might be used to manipulate the /usr partition, if proper considerations are made for any of its executable files and their libraries, which might become unavailable during the chosen evolution. The ramdisk kernel or an alternate drive are likely to be preferable.