How to fail-proof moving /home to a new partition

Question

I'm in the process of moving /home to a new partition. I have copied the old /home to the new partition (with cp -rp). Next step is to modify /ect/fstab and reboot. However, if something goes wrong I wouldn't be able to log in and repair, I guess..

My current /etc/fstab:

UUID=7132fbfe-7a91-4965-b5f4-cb65fd65558f /     ext4    errors=remount-ro   0 1
UUID=D273-8E7E  /boot/efi       vfat    umask=0077                          0 1
/swapfile 

Here are the block IDs:

$ sudo blkid /dev/sda4
/dev/sda4: UUID="7132fbfe-7a91-4965-b5f4-cb65fd65558f" TYPE="ext4" PARTUUID="075222a8-d450-48c7-9e94-861fe5d4eed0"

$ sudo blkid /dev/sda5
/dev/sda5: UUID="1b4ad4ea-83b8-4dd7-b94e-2cfc04ef1c3f" TYPE="ext4" PARTUUID="ed59a38f-1f34-c441-82fc-f578bcd700a3"

Here the partition table:

Device          Start        End    Sectors   Size Type
/dev/sda1        2048    1026047    1024000   500M EFI System
/dev/sda2     1026048    1288191     262144   128M Microsoft reserved
/dev/sda3     1288192  439164927  437876736 208.8G Microsoft basic data
/dev/sda4   439164928  634476543  195311616  93.1G Linux filesystem
/dev/sda5   634476544 1959163903 1324687360 631.7G Linux filesystem
/dev/sda6  1959163904 1975164927   16001024   7.6G Linux swap
/dev/sda7  1976086528 2000408575   24322048  11.6G Windows recovery environment

Proposed new /etc/fstab:

UUID=7132fbfe-7a91-4965-b5f4-cb65fd65558f /      ext4   errors=remount-ro 0 1
UUID=1b4ad4ea-83b8-4dd7-b94e-2cfc04ef1c3f /home  ext4   defaults          0 2
UUID=D273-8E7E  /boot/efi       vfat    umask=0077      0       1
/swapfile 

But, what about the /home directory in sda4? When do I remove this? I am currently executing these steps logged in as a "user" using sudo. Should I log out as a user and proceed in a different run level?

What precautions can I take to make this step as safe as possible?