I try not to judge myself and my beliefs. I don't think of them as true/false but just as what I am currently thinking (and I check to make sure I know what it is I am currently thinking and feeling) and then I think about how I would like things to be and go working on how I can make that happen.

I did not like when I caught myself putting myself down in my head so I countered with supporting thoughts and nit picking the negative thoughts (they're usually vague so easy to make fun of and they have no arguments of their own to support themselves with; being "stupid," for example, is kind of meaningless as we're not all one thing or another ever and a mistake is not stupidity but an opportunity to learn, etc.).

Currently I am working daily with a phrase I ask myself as often as I can think to: "Is THIS what you want to do?" Works for any activity; eating, drinking, being on the internet, watching TV; I just check with myself often to make sure I'm doing at that moment what I want to be doing at that moment, a kind of mindfulness of an unobtrusive sort.