Pay attention to where your money is going. Carry a little memo pad around and keep track of everything you spend. Like magic, the simple act of writing stuff down will often keep you from spending money. It also helps you to look at where your money is going and allows you to make informed decisions about how much money you really need to live the life you want.
I've been giving financial advice for 40 years, and I'm a millionaire several times over. Here are the 10 best bits of financial advice I've both given and taken.