That's similar to me, I started using FreeNAS back in the 9.x days.

At the time the FreeNAS documentation recommend installing to a usb drive. This proved unreliable, but dedicating a drive to it was silly given it couldn't be used for anything else. I had all the things I needed but I wanted to peel back the layers and this seemed like a good excuse

So I threw in a drive and installed freebsd 10 and spent a few days familiarising myself with everything, learned how to configure samba myself, learned how to setup jails with iocage (the old shell version), and finally imported my pool.

Years later very little has changed.