[otrs] perl migration script help

Hello! I am trying to upgrade from 2.3.4 to 2.4.3, and I'm a bit lost on what to do for running the perl migration script http://faq.otrs.org/otrs/public.pl?Action=PublicFAQ&Subaction=Print&Category... I have MySQL Tools installed and so have used MySQL Admin to backup and restore, and MySQL Query Browser to run the first upgrade script ( DBUpdate-to-2.4.mysql.sql ). I am not sure how to run the Perl migration script, can someone please give me a couple of pointers? Thanks in advance Emily