Hi Jordan. That takes almost as much work as recreating the site. I hope I can find a way to upgrade.

>Install DNN 4.3.5,
>upload all external modules which you use,if they has 4.3.X version
>add skin,
>make the same menu structure,
>install the modules on the pages.
>Transfer manually content in core DNN in pages, there no way to move it using some scripts
>
>Open your SQL Enterprise Manager
>Make backup of the DB
>this is actions for external modules only
>Compare DB structure of 3.2 and 4.3 modules, if it is the same
>find their new ModuleID and replace in old tables.
>If you had more than one installation on pages the modules are saved with diffrent ModuleID and you should find the proper one for replace
>Copy table in your new DB.
>Copy suplemental folders - images, files, etc.
>
>I was able to transfer only sites done with our own modules
>the job is not easy :-(
>
>HTH