There is also a text-only (command-line-driven) guide for this process here. I would recommend it to intermediate-to-advanced users. It's simple, and it works, but it also assumes you already have a new partition created for /home.
You must use a live CD for this process for two reasons:
I'm using the example of a Ubuntu live CD and GParted, but you can very well use QTParted on Knoppix or DiskDrake on PCLinuxOS.
Making the new partition
Boot up a live CD and in your live session, install GParted (and ntfsprogs, just in case you're carving a partition out of an existing NTFS partition... before resizing an NTFS partition, though, make sure you defragment it in Windows). You can use Synaptic Package Manager to install it (Don't know what Synaptic is? Look here, or if you prefer the command-line, go to the terminal and type in
Then, press Alt-F2 and type
In GParted, find the partition you want to resize in order to make room for your upcoming /home partition. In this case, I'm resizing /dev/hda5, but your partition may be different. Be sure to keep track of the names of your partitions--these names are very important (/dev/hda1, /dev/hdb1, /dev/sda2, etc.).
Right-click on the partition and choose the Resize/Move option.
Choose the new size you want.
Then, in the new empty space, right-click and select New.
Choose to create the partition as Filesystem ext3.
When you're satisfied with your new partition layout, click Apply
Once the changes have been applied, make note of the partition name of your new partition and then quit GParted.
Now, in my example, my original partition that I shrunk was /dev/hda5, and it created a new partition called /dev/hda7, and my /home folder lives on /dev/hda1. It's very important that you substitute in your own appropriate partition names for the ones I'm using--you most likely will have only two partitions you're dealing with--the one you shrunk and the newly created one.
Using the new partition
Now, back in the terminal, I'm going to mount /dev/hda1 and /dev/hda7:
Now we're going to back up the /home directory on the old partition and move it to the new partition:
Yes, one of those lines looks really complicated--please type it as is--or, if you're unsure of your typing skills, copy and paste it into the terminal. Believe me--the command is necessary.
Next, we're going to specify to use the new home partition as /home:
You'll then be taken to the nano text editor. Add in this line:
Then save (Control-X), confirm (Y), and exit (Enter)
After you reboot, you should be now using your new /home partition.
If you find that you are running out of room on your old partition and you're pretty confident everything is working as it should be, then go ahead and delete the backup of home:
What if it doesn't work?
You know, it really should work, but if you somehow messed up your /etc/fstab and didn't configure it correctly... well, that's why we have a live CD, so we can fix things.
Boot up the live CD, go to a terminal, and type:
Then, reboot.
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