Best of luck to you! I would just try to focus on the job at hand and what you can provide. Ask a lot of questions that show your interest in the postion. If you have a block, you may want to mention that you refuse to let something as trivial as stuttering stand in the way of your goals. As one who stutters, I know stuttering is far from trivial; from an outside perspective, it seems to be considered as such. Practicing with a friend is also benificial. Be confident and be yourself! Godspeed