You can do it yourself if you're into it and have the time.
My truck was pretty rusty, so it took extra time for me, and I purposely took mytime as well. It took me about 8-10 hours. I had trouble with radiator bolts breaking off, stripping the little nuts on the fan, and various other little corrosion-related issues that were pretty fun :-(
I'd be happy to answer any "stupid" questions, because I just went through it and I'm kind-of stupid myself sometimes. It went well, all in all. I got stuck a few times, so I really do understand where you're at. This is a great list. The help I've received here is incredible. If the valves got bent, I'd personally consider a used or rebuilt engine, but if adventure is where you're at, tear it down and check it out.