Generally speaking its better in the long run to create a new Perl installation for your work, including installing libraries, and leave your system Perl alone.

It's a pain to manage Perl installations and it's a pain to have to become root to work, so many people choose to install Perl without root privileges. Many people use Perlbrew which will install a new Perl version in your home directory and allow you to install libs there with no root access needed.