Basically anything DIY will cost you 10x less than hiring someone. Cooking, car maintenance, home projects, gardening, etc. Many of these are functional skills that are useful throughout life, like basic mechanical/tools knowledge.
That is true for certain types of work but to the contrary for others. Projects where the risk of doing a poor job is within an acceptable range are those that one ought to give DIY a try. For instance, I've replaced bathroom sink plumbing at least 5 times on my own. The worst that has happened was that the connections weren't sufficiently tightened and water leaked until I addressed the issue. Cutting pipes too short would be an inconvenience but still not a big deal.
