You can do it...it's a nuts & bolts job, not too tough...just time-consuming. We're here for you.
I'd estimate it'd cost you about $150 in gaskets & supplies. Much more if the head warped. You're actually saving money...if you can't finish it off, just tow it to a mechanic then. He'll charge you what it'd normally cost...so even if you fail you're only a little behind the game.