Unpack your cursor package to ~/.icons/.
The directory structure should be:
~/.icons ~/.icons/theme_name ~/.icons/theme_name/cursors
Create a symbolic link between ~/.icons/default and the theme_name and restart X.
ln -s ~/.icons/theme_name ~/.icons/default
If you have any issues, remove the symbolic link:
create a ~/.icons/default directory
and insert the following file (index.theme) into the ~/.icons/default directory:
touch ~/.icons/default/index.theme vi ~/.icons/default/index.theme 1 [Icon Theme] 2 Inherit=theme_name