Rehearsing helps a lot. If the talk you are about to give is not that important to you and you do not want to spend too much time on rehearsing, do at least rehearse your introduction and connecting parts between, say, long proofs.

If you are going to draw any figures on the blackboard during your talk, then it is a good idea to actually draw them at least once during rehearsing as well (perhaps replacing the blackboard with a piece of paper). This will not only help you to improve your figures, but will also give you a better estimation of the time you are going to need.

A. Georgakopoulos: How to give a talk that is not too bad.

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