Upgrade forms from 12.2.1.2 to 12.2.1.3

Hi all, since premier support for Forms (and WLS) 12.2.1.2 ends this year, we are planning to upgrade to 12.2.1.3.  The only documentation I've found so far is a pure bare-bones installation.  Is there an upgrade path or upgrade assistant to move from .2 to .3?  If not, is there a way to migrate existing .confs to the new version, or does everything have to be reconfigured from square 1?  I'm assuming I won't have to recompile my forms and reports from 12.2.1.2, simply point my new Forms server to the same forms directory I'm currently using.

I know many people have already upgraded, and I'm hoping someone can guide me to the appropriate upgrade reference document.