I've gotten a lot of bad advice, but I think one of the ones that have stuck with me is: Let professionals take care of it.
Don't get me wrong, having someone who knows what they are doing is great. However, the professionals got where they are by actually doing stuff. If everyone left everything to "the professionals," it could get to a point where no one knows how to do anything at all without calling someone else.
This goes without saying that sometimes you NEED someone else to do something, especially when it could be dangerous. Electricity, construction, etc. But mundane stuff can always be tackled by everyday people. If you don't WANT to do something, then that's a completely different story. But if I am trying to do something myself, and someone else stops me to say "you can't do this," then it gives me the motivation to say "yes I can."
A little context:
This came from me trying to fix a bathroom sink. I had already gotten halfway through it when my roommate started berating me for "making a mess" in their bathroom. It made me wonder if she realized that the plumber would have made MORE of a mess than I did. Yes. I cleaned it up. Of course, I moved out not long after, because apparently, my contributions to the house weren't enough. But that goes on a different rant, and here isn't the place.