I relate. I like working on my car for similar reasons. As others have touched on, you feel like you’re cheating the system when you do it yourself and save money. Very satisfying.

I was able to replace a light in the bathroom with an energy saving led version and although the result isn’t perfect it gave me a lot of satisfaction knowing I had succeeded doing that for the first time and saved a few hundred to the electrician.

All the time. That and maintenance. I got so much joy from finally having the supplies to change my car oil at home.

I keep having better salaries in time. I noticed, I still manage to not save any money from one year to the next. Why? Objects require maintenance/repair/cosmetic care a lot faster than I can afford to keep replacing them. Buying something new feels profoundly shallow and ungrateful based on what good objects I have. Example: i had a xiaomi robot vacuum. Almost replaced it when I realised I'm better off replacing the battery (that's what I assumed was broken). For 20$ i extended its life for another 2-5 years. Respect for the object, respect for the time I spent earning how much it cost, and by extent, respect for myself and my life.