Talking shop - again!

I’m due to be giving a talk on midwifery at church this evening. Despite being able to talk about my job with people almost endlessly, I find the thought of getting up and doing so to a roomful of people (even though I know them all fairly well and they are very friendly) quite nerve-racking. However, I think I am better prepared than I was last time I talked about midwifery at church which makes me feel a little better, but still I find myself wondering how I manage to get talked into doing these things in the first place!