exchange 2010 to exchange 2013 migration considerations when journaling involved

I am planning to migrate from exchange 2010 to exchange 2013. I currently have two mailbox databases: one for user mailboxes and one for journal mailboxes. How does the typical exchange migration change when journaling is involved and is there a different order to do things in? I will not be moving all mailboxes over at once, also; they will be moved in stages.

Thanks in advance!