Having been through several other Apple recalls, the process if you have an affected machine is pretty straight forward but you may be without a machine for a while as it is replaced. Just be sure to use Apple’s Time Machine program to back up your system before you turn it in for the replacement. This is because the drive will be replaced and you will essentially receive back a completely blank system as if it were brand new. Thus, you will need to restore your system using the Time Machine recovery process. For more details on using this, check out Apple’s page, specifically the Restoring data from Time Machine backups.