Not too far off from what my father told me when I was a kid: "...the more you know the less you know..." Thanks for for your efforts...Even as you encounter new problems, it does not diminsh what you've learned. Clearly, I don't know everything. But does that mean that I cannot help others by imparting what I do know. View each new obstacle as an opportunity to increase your knowledge base so that you can help others with those kinds of problems. And never forget that the more you learn, the better will be your guesses.