I've thought of trying to find a football game on somewhere and DVR'ing it and then just recording myself on my laptop so I can hear myself, practice projecting my voice into a microphone, etc. Plus, I can share the recording w/ people to listen and give me feedback.
I had a meeting with Chris Kerber a couple years ago about a web project he was thinking about putting together, and he was talking with a guy at a bar who had just started broadcasting school, or whatever. Kerbs told him that the best thing you can do is do what you said...DVR a game, turn the volume down and record yourself calling the game and then listen to it to hear how you sound. Think about how you want to get better, and do it again and again.
Oh, and for some reason I remember Jack Buck saying one time to never run to your microphone. If you are running late, it's better to be 30 seconds late than to be out of breath when you get to the microphone.
When we do the Lets Go Blues Radio podcast, it helped me early on to listen to the shows and hear myself. I think I sound better now than I did when we started (not that I am great now or anything)...but I still catch myself talking too fast at times.
- Don't be monotone. That gets boring real quick. Practice variance in your voice...it makes a huge difference.
- Slow down and be clear in what you are saying.
- Make it interesting.
Maybe you should ask Ponder if you could come on the Lets Go Blues Radio podcast for some guest analysis or something? It might give you a feel for talking into a microphone for an audience.
If you have a decent internet connection, a webcam and a mic...you can participate from your couch.