We all make mistakes, but speakers who make a point of learning from their mistakes report that their successive, follow-up efforts are particularly effective.

From interviewing successful speakers, I have discovered what high achievers consider these mistakes to be. The errors they say they'll never make again include:

1. Feeling terrified before speaking in front of groups 

When facing stress, we have two options: feel scared to death, or else excited, at the opportunity to share our message with the world. Successful speakers choose to turn their nervousness into excitement. They focus on transforming lives and making a big impact.

2. Joining Toastmasters

Successful speakers don't go to Toastmasters, because the organization's forced-to-clap environment is unrealistic. Successful speakers practice public speaking in front of live audiences that provide constructive feedback. The realistic environment helps them grow and succeed faster.

3. Having a voice that shakes

Celebrity voice coach Roger Love says, “People judge you in the first 15 seconds while you're speaking.” Having a powerful voice makes a big difference. Breathe in through your nose, fill your tummy as if the air is going in there, and then speak only while your stomach is expelling air. 

Learn Entrepreneur.com's remaining seven mistakes successful speakers will never make again.