I think it's a good idea to do both these things at the same time. I agree with cobra that it can be useful to know why people are doing these things, where the behaviors come from, FOO stuff, making unconscious things conscious, etc. And besides, I just want to know this stuff.
But some people get stuck in needing to know "why" before they are willing to make any changes. They can even use not knowing why as an excuse for not making any changes. The why can take a long time, and in fact, may never be totally answered. So I think it's good to change behaviors in a positive direction, too, even before you know why you were doing the negative stuff.
This may not be true 100.00% of the time, but I think it's a good principle.
