In contrast to some of the other posters, I love to DIY a lot of routine stuff-- cleaning, of course, cooking, hemming clothes, growing herbs. I like that it's something I need to do fairly often, so every time I do it I'm getting the CHA-CHING feeling of saving money, and that repetition means I'll have an opportunity to get better over time. These sorts of things tend to have immediate and fun payoffs too-- it took me years to learn to cook a steak well, but eating four years worth of overdone steak wasn't exactly a chore either. :3
For big projects that I'm doing for the first (and maybe only time), I get very anxious that I'll fuck it all up due to my lack of experience, fuck up whatever I'm working on big time, and need to pay more to get it fixed or redone in the end. Also, big projects often require things that aren't available or financially or physically practical for my living situation (small apartment with limited space, no workshop area, few tools and no place to store them). But seeing all of the DIY home stuff from MMM and a lot of the posters makes me a bit envious-- maybe one day I'll be able to join their ranks.