"We're gonna need another Timmy!"

QUOTE
I work in a DIY store, and people come in all the time expecting to be told how to rewire things and replace things. I just tell them to get an electrician.
I'll go to the store and ask about the best way to implement an idea I've already had, am okay putting together, and just don't know what parts to use. But if I don't even know what to do with the parts I get, or need any sort of basic level "how-to" on a thing, I know I shouldn't be doing it myself.
There's something to be said for learning, but you've got to do it at the right level, and should ramp up at a comfortable pace. I did too much at my last house, and I'm lucky it all worked as well as it did. These days I'm a lot better about calling in help when I need it rather than killing a whole weekend going back and forth to the store and cursing at stuff I'm not doing a good job with. The idea of "saving money" goes out the window when you've spent too much of your own time and have bought enough parts to make up the difference anyway.
Unless it's a hobby...then it's different. But all that stuff is just "chores" to me, so I call someone if it's not something I already know or think I could quickly learn.