The first thing you should do is to tell the crowd that you stutter and tht you will appreciate the patience. The monkey will be off your back trust me. Start with something informal that you are comfortable with. May be a walk around the stage will help you cool your nerves. Yes you wil still stammer but not that bad. Find someone listening to you and keep the eye contact. As a senior software dev, even i have to present a lot of things. I stammer but i also tell my audience if yoh dont understand anything let me knw i will repeat again.