One thing that has helped me a little bit is differentiating between my actual experience and things I've read or just thought about. I've experienced the sun coming up every day for 60 years so I'm pretty sure it will come up tomorrow. No, not 100% but I don't worry about the sun coming up. That's another thing; we tend to worry about what we know least? So, when I worry or realize something doesn't seem to be like I believe, I study the heck out of it if it's important to me until I'm again comfortable with what I believe. A lot of "belief" is just opinion though and if you're comfortable with your belief/opinion and why you believe what you believe, it should be pretty hard to shake a belief.

But after many errors, I have learned to stay away from saying anything like, "I would never do X," especially if I've never been in that situation. Anything hard or fast I take a good look at because most things are complex not just one or two dimensional. One can't know the whole of something alive/complex but that does not negate what one does know! People behave differently in different situations, why not light or other aspects of physics, math, etc. :-) We just don't know it all yet and learning new parts increases knowledge, it shouldn't detract from belief. Belief should not be static either.