I had to give a best man speech a couple of years ago. . The first sentence I just made a joke about it and it relaxed me and prepared all the audience that I was going to stutter and it's going to be OK. My opening line was "well I was asked to give a speech. I've had a bunch of drinks and have a stutter so brace yourselves(everyone laughed). I'd like to start by telling" the grooms name" they're an asshole for making me do this.(everyone laughed again and no one cared I stuttered through the rest of the speech) Just show you own it and you'll be OK.