If you think about something too much, you end up taking the fun away from it.

Although it's never a good idea to plunge into something blindly, it's also bad to think about something too much. When you think too much about something, all sorts of "What-ifs" come to mind. At first, they are rational ones that could happen. But the longer you think about it, the more weird and far off they become, and you just come up with so many other worse case scenarious that are impossible but stop you from doing something.

I do that all the time. It's a bad thing. :)

Sometimes, it's good to just think about what you want, what to do to get it, the people involved, and then just DO IT.