[hknmtt]

Fear comes from the unknown - that you will be exposed as fraud by the audience. So if you know your stuff, the topic of your talk, inside and out, you will be confident in what you say and therefore the way you present it.

Second thing is to do something like Till Lindemann, the lead singer from Rammstein, did. he too had massive stage freight so ho came up witch a character and his entire performance is exactly that - a performance. So you interact with the audience through this mask, this filer, of a made up persona and so it's not really you doing the talking. At least that is how your mind will rationalize it.