Don't be too safe.
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When you try to be too safe,it's usually boring. When no risk is involved,we don't get interested.Why people like watching football?Because there's risk,someone can get hurt.Why people like Steve Jobs?Because he was willing to take the risk.
If you are a presenter or a speaker,you can try new things in a safe place like Toastmasters club,but sooner or later you got to take the risk and speak outside the club.Reality will sometimes hit you hard,but that's the only way you can get better.
Why not taking the risk..starting today?