I guess my biggest obsctacle is lacking a clear sense of what I want. I'm interested in a huge variety of things and I find my mind keeps jumping from one thing to another in a matter of hours. Last Saturday, for example, I woke up fully determined to spend the day learning Arabic, something I've wanted to do for a while now. As it happened, I got on Wikipedia to look something up, and then just kept link hopping till I got off the computer in the evening, having read all about the Thirty Years War. I wouldn't say it wasn't fruitful, but I didn't stick to my goals for the day. I guess it's a combination of a lack of motivation, a lack of discipline, and some really crap planning. It's affected me a lot both in my personal and professional life.