Giving head

I’ve never done it before, but I want to. I’m not sure exactly how to do it, but I’m wondering... does it come naturally? Like do you just know what to do once you’re in that moment? I never felt ready with my ex boyfriends, but now I do I just don’t know how to do it. I’ve seen some people comment on other posts “You either know how to suck dick or you don’t”, but then I also have friends who say it’s really not that hard and it will come to me naturally. I just don’t want to embarrass myself. I feel I’m too old to not know how to do it.