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Once you've drafted your speech, re-read it to make sure that you didn't leave out anything important or that you haven't unnecessarily repeated information. The more you practice saying your speech out loud, the more comfortable you'll be giving it in front of others. You can practice by reciting your speech in front of a mirror, or by asking a friend to listen to your speech and give you feedback. You don't have to memorize the speech, but it should be clear that you know what's coming next while you're speaking. Four to six minutes will fly by when you're actually giving your speech, so you should time yourself before you give it for real. You can use a clock, your watch, or your phone to time yourself, or you can ask someone else to time it for you. If a friend helps you, they can also listen for filler words like "you know," "so," and "um." An icebreaker speech doesn't have to be super formal, it should still sound prepared.
Re-read your speech. Practice giving your icebreaker at home. Time your speech.