Why don't you try starting with the things you already do? How do you spend your free time, typically? You might read some Less Wrong, you might post some comments on forums, you might play video games. Then maybe think of a tiny, little extension of those activities. When you read Less Wrong, if you normally don't think too hard about the problems or thought experiments posed, maybe spend five minutes (or two minutes) by the clock trying to work it out yourself. If you typically post short comments, maybe try to write a longer, more detailed post for every two or three short ones. If you think you watch too much TV, maybe try to cut out 20 minutes and spend those 20 minutes doing something low effort but slightly better, like doing some light reading. Try to be patient with yourself and give yourself a gentle, non-intimidating ramp to "bettering yourself". :)