I've had to talk myself into going on some crazy roller-coasters. After the experience though, I'm extremely glad that I did.

Yes, but it can be either a bad sign about what you're trying to talk yourself into, or about your state of mind. It simply means that your previous position was held strongly - not because of strong rational evidence alone, because stronger evidence can override that - the act of assimilating the information precludes talking yourself into it. If you have to talk yourself into something, it probably means that there is an irrational aspect to your attachment to the alternative. And that irrational, often emotional attachment can be either right or wrong; were this not true, gut feeling would answer every question truthfully, and the first plausible explanation one could think of would always be correct.