I would share my opinion, but that would be prideful… and not mention out of character, for me (drum roll please). So I’ll share someone else’s opinion:

“Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God.” - Paul of Tarsus

And reading ability/inability to function as a “podcaster”, may I point out an extract of your question:

“Or say you feel like pod-casting is something that you SHOULD be doing.” (emphasis)

Now my opinion:

Why do you say you “should”? Could the fact that you believe it to be something that you “should be doing” be enough reason to “take the plunge and throw caution to the wind and do it”?

Another quote:

“I am very, very sorry for my fast speech.  I have apologized many times, but like unsatisfactory repentance, I haven’t changed.  I am able to preach victory (I don’t say live it) in any other respect, but not a slow tongue.  I can’t get that one!  Also I am sorry to say that my voice has disappeared into my boots.” - Norman Grubb (on his loathing of public speaking)

I know for myself, as a podcaster, beginning to record an episode is painful. Speaking into a microphone in an empty room (or empty car), seems to be the most ludicrous thing in the world (kinda like looking over at the guy in the car next to you, and realising his amusement at your “over-exuberant” singing).

If God has given you the burden to podcast, then what is to fear?