Self-performance is possible for anyone with a healthy body. If someone doesn’t want to do it because it’s too exhausting or time-consuming, they can simply call in a craftsman and pay for it. But it is definitely possible, as long as you don’t live dozens of hours away. We have done a lot ourselves and still do. We felt our way into it. By now we can do drywall, plastering, simple electrical work (but here we always have a friend who is an electrician take a look!), lay floors, install doors and windows. We have installed interior window sills, built entire walls with drywall, hung toilets, sinks. Of course also the classics like painting, filling, wallpaper etc.. We have sanded and re-stained stairs. And surely even more that I can’t think of right now.
We only give up on roof, facade, tiles, gas and water (no claim to completeness). For those, we call in craftsmen when necessary ;). In the garden, I will soon build a raised bed out of bricks. And I am a woman – you just have to educate yourself, need proper tools and materials, and then you get better with practice.