On 13.03.2015 17:21, Bob Goodwin wrote: ...
If I botch this I can still re-install and start from scratch again but would prefer not.
Consider these two applications:
Graphical disk usage statistics - Qt/KDE - https://userbase.kde.org/Filelight Filelight allows you to quickly understand exactly where your diskspace is being used by graphically representing your file system.
A graphical directory tree analyzer - Gtk/GNOME - https://wiki.gnome.org/Apps/Baobab Baobab is able to scan either specific directories or the whole filesystem, in order to give the user a graphical tree representation including each directory size or percentage in the branch. It also auto-detects in real-time any change made to your home folder as far as any mounted/unmounted device.
Prior to installation, find the largest packages: $ rpm -qa --qf '%{size}\t%{name}\n' | sort -n
and uninstall the largest until you resolve the overflow issue.