First of all: congratulations for being brave and calling yourself. Don’t be ashamed, you tried your best. What I find most useful is not having a preset of what I’m about to say in my mind. I just follow the thought process and go with it. Remember to not get into your mind, stuttering occur and you don’t have to panic when it does or else it get worse. You did a great job by trying, you should definitely do it again next time