Hang out on Perlmonks a lot. Try to answer simple questions and study the more complicated ones.
Look around you: is there anything you can automate by using Perl? Perl shines in small scripts that can do a lot of routine jobs: you have to move the log-files of your web-servers to archive-storage at the end of each week? Write a Perl-script to do it for you! You receive reports and data in various formats from different sources? Write a Perl script that parses those reports and transforms the data into a common format, ready to store in your database. Then write a Perl script that makes a nice report for management with one push of a button.
A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James
My blog: Imperial Deltronics