I guess people don't read. He said that he was trying to avoid the
commandline.

You can make a new partition in the Partition Editor. I am in KDE so can't
be sure of the precise name or location in GNOME. It is in the System,
Administration menu. In KDE it is under System. First you need to work from
an unmounted file system, so it is best to work from the Live CD. Choose
the drive under Devices. Choose the drive. Resize it (smaller) and make the
new partition in the freed space. You obviously need lots of unused space to
do this. If your drive is full then don't try.
You need to create a folder named after your user name. You can do this from
Nautilus. Note: case matters, so use all lowercase.

To change your home directory you need to go to Users & Groups and make the
change there. Unlock it first with your password.

The best method of doing this is to choose manual or custom partitioning at
the time of installation. It is a good idea to have the partitioning done
ahead of time, but you cna edit the partitions from the installer. Once you
have two partitions, you set the mount points with / for root and /home for
home. Do NOT format /home or it will wipe out your data and settings. You
should format /. Choose your old user name and password when it comes to
that.