You don't HAVE to do it yourself. You should be able to fix a flat yourself because it can be so inconvenient to depend on others for that. I am very mechanically inclined. I worked as an auto mechanic when I was young. I do most of my bike repairs myself. On the other hand, I don't get along well with wood. Because it has a grain, it acts like it has a mind of its own. I learned years ago that I'll never be a cabinet maker. I don't beat myself up over it. I buy furniture other people make and work on my own cars, bikes, and appliances.

Even though I'm good at mechanical stuff, I always give myself extra time because I'm doing a particular repair for the first time so often. My wife asks me how long a repair on the car will take, I'll say "It should be a 15 minute job. Give me 2 hours."