As a short-haired person for probably ten+ years now, I have to disagree! Long hair was always way more work for me (took forever to dry, brush, was generally unruly and uncomfortable) than my short hair. If you get a good cut, you really don't have to put that much effort into styling, unless you want to. I get my hair cut every three months, roughly, and while yeah, that means I spend about 45 dollars per year on my hair, I don't feel like that's a budget-breaker. It also means my hair care products last a whole lot longer, and I spend way less time doing anything to it (such as drying it with a hairdryer, braiding, etc.), or damaging it with hair ties (was always a problem when I had long hair).
TL;DR: people have different opinions about hair and mine is that short hair is way easier.
But yeah, pretty much rehashing what a lot of other people have said. Making own food, no cable/Netflix, going to libraries, etc. In the case of buying something that's a necessity (like winter boots for Chicago), I do a lot of research first and try to buy at the right time of year, when things are on sale. I also might sacrifice my own preferences for a better price. In the case of the winter boots, I would have preferred black, but there was a discontinued blue coloration that was heavily discounted (about 40 bucks less than the already sale-priced black ones), so I went with that. I guess that's not really something I did myself, but it definitely helped save money (here's hoping that the reviews were right and the boots last for years). I also knit my own hats and stuff from a huge yarn stash that was given to me by relatives.