FreeNAS is pretty advanced. If you are willing to learn, there's lots of info around the forum. You just have to find it, read it, and understand it. A good starting place is my noobie guide (link is in my sig). Our forum stickies are definitely good to read. I will warn you that this won't come overnight. It will take time and effort (and hopefully no data loss if you do your homework). At first you are going to feel overwhelmed. It's like sipping from a firehose. Just give it time to sink in. Play with FreeNAS in a VM or on test hardware if you have to before actually buying your final FreeNAS box.
FreeNAS isn't for everyone either. My mom has no chance of ever understanding FreeNAS, even if her life depended on it. Lots of people try FreeNAS and go back to sticking to what they know. There's no shame in that. But ZFS is pretty awesome and FreeNAS is probably the easiest way you're going to be able to enjoy ZFS without paying some ZFS admin to maintain your server. ;)