Cut out the middle man
Once you know how to do something, it can be a great relief. If you know how to do something to solve your problems, for example, the problems starts to look like less of one. However, thinking you know the answer, and then actually implementing the solution are two completely different things.
If you f*ck and find out, so to speak, you cut out the middle man. You go straight from having a potential solution to a problem to knowing for certain whether that solution works or not. In other words, FAFO is onto something.