I hate to admit it, but I have a pretty short attention span. And I have a tendency to get really really excited about things. These two traits combined means that when I get an idea in my head, I NEED to do it right then. I plan the whole thing out in my head and I spend all day thinking and dreaming about it. And if I act on these impulse ideas, which usually require spending money, I suddenly don't care about them anymore. The lust is gone, and suddenly I've spent money on something that I didn't need and now don't even want.
Thus I have instigated the thirty day rule in my life.
This is sort of a standard tip for saving money, but it really works. When I get the idea, I write it down (usually in my google docs so I can organize it and re-access it easily), and then I wait. Despite the temptation to act on it immediately and buy up the entire local home depot, I continue to wait.
And then a few weeks later I browse back through my Google Docs and am able to weed through the ideas. Miraculously, I don't care about 99% of them anymore. If I am still as excited about an idea as I was originally, I know that it's something that is worth my time and money. And if I'm not, it gets trashed.
This rule has saved me tons of money and time over the years because I'm not just spending and projecting willy nilly. I take time to think through the projects that I want to undertake and try to only do the necessary and important ones. Emphasis on try...