I learned to fix things myself because we couldn't afford to hire people. With just a bit of help, maybe a book or the advice of someone who knows how to do the thing needed, I find that I can do pretty well myself. Some things, like sweating copper pipe together, are a manual skill that you get better at as you do more of it, so my work is not as pretty as a more experienced person - but it works.
And as someone said, if I mess up the first time, I can fix it the second time.
Now that I'm old, I've been through most of the house things so I feel fairly confident that I can do whatever needs to be done and I have most of the tools to do those things.
We did some major renovations to a house we were living in some years ago. Before the contractor started, I had a talk with him and told him that I would measure and check everything he did, and if it wasn't according to the specifications, I'd have him tear it out and re-do it. One case was a wall that they put in that was a couple of inches off, but I needed those inches for a hallway, and code requires the hallway to be a certain width. His mistake would push everything over. I insisted they move the wall to the proper place. After that, for future walls, they didn't drive the nails all the way in on the bottom of the wall 2x4's until after I had checked the location. I'm sure I was a PITA to the contractor but he and I got along well.
Go into the world and do well. But more importantly, go into the world and do good.