Installing/upgrading perl is a pretty straight forward task and is necessary for cPanel to function properly.

root@ohhai [~]# wget http://layer1.cpanel.net/perl588installer.tar.gz
root@ohhai [~]# tar -xvzf perl588installer.tar.gz
root@ohhai [~]# cd perl588installer
root@ohhai [~]# ./install

If I remember correctly, the install takes 25-30 minutes to complete depending on your server setup.

Very simple install, only 4 commands via SSH and takes about 20 minutes for the install to complete.

wget http://layer1.cpanel.net/perl588installer.tar.gz
tar -xvzf perl588installer.tar.gz
cd perl588installer
./install