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A general overview:

1. Log in as root directly, no `sudo` or `su` (you may need to activate it temporarily, depending on your distribution) or boot from a live system
2. unmount `/home` and mount it somewhere else ( e.g. `/mnt/`)
3. move your data from your temporary mountpoint to `/home`
4. unmount and delete your home partition
5. grow the root partition to use the freed space (how exactly depends on the partition layout and if lvm is used or not)
6. extend the filesystem of the root partition for new new size (how exactly depends on the used filesystem)
7. log out as root and log in as your regular user again
8. (disable root user again)