thrillreefer, that's hilarious!
I certainly agree that most other things can be done yourself depending on your particular expertise. I'd say there are some things that the "average" person probably shouldn't do, unless they're just doing it for the experience. I think chillers were mentioned. I'd say protein skimmer as well if you want really good quality, but I'm sure plenty would disagree with me there. A DIY controller generally requires about a 50 lb brain. DIY LED lighting has been brought up many times, but that's definitely one I wouldn't try. I definitely don't see anything wrong with trying most things, even if you fail. Just do some research, ask questions, and decide for yourself whether or not you feel up to the challenge.