I make a chart and I record every time I spend money. From big supermarket purchases to buying a newspaper from a vendor. I find that helps me realize where my money is going, and what can be cut out.
Also, before making a purchase I always ask myself 'do I really need this?' Especially if it's something like a piece of clothing or something expensive. Is it something that I will use a lot? or not really? If it's something that I know I will use a lot, then I buy it as I see it as an investment. Otherwise, I normally don't bother with it.