How to migrate from regular MySQL to Percona Server in production
MySQL and Percona Server are binary compatible so the migration process should be like an ordinary MySQL upgrade process. Therefore the usual recommendation is to take a backup and then update it. Since you are going to migrate on production server is important to mention that the process has a downtime. It will be better if you first have the opportunity to test the migration process on a dev machine.
If you are migrating from different versions, for example from MySQL 5.1 to Percona Server 5.5 then you have to take some precautions.