I had presentation last year. Nailed it since I took solid 1-2 hours looking for synonyms of words. I am extremely fluent with vowels. So I took my time to research. However I cant do always like this since I would be having more presentations in future. The major words I stutter with is 'k' 'c' 'b' Do you have any specific techniques for this? I made techniques for vowels and that was to breathe first while speaking. Works smoothly and has reduced 60% of my anxiety. Only words left are k,c,b then I am conquering the world.