Blimey dev, It is one thing to advise. A totally different thing to go out there and deliver it unsupported.
We're not all as sure as we sound, but we are determined, as are you.
And you know what, we learn from each other too. Only by making a claim or offering advice with an air of certainty can someone come in with a counter argument, or challenge and as long as you can 'take it' which I think is the real skill lots have on this board, then you learn, and the advice you offer next time is one notch up.
Why don't you try. Find a poster asking about an issue that you know a bit about and post some advice. Do a link and then have someone more experienced than you point out that you got the gist but missed x or y.
That's how I have learned. Believe it or not I have had some quite hard batterings. But all generally well meaning, if blunt.
The more certain you are, the blunter the challenge btw, and the faster the learning.