But there are no practice runs. For saying a particularly wrong thing, or for saying nothing, you can get labeled as insensitive and rude forever, even if you said it accidentally because you are a creature of extreme awkwardness.
Sometimes you can just smile broadly and shrug your shoulders. It’s not optimal but can be better than the alternative.
(Also, practice small talk in the shower)
Even plain small talk with people you don’t know very well can go devastatingly wrong. For example, if you ask them what they do for a living, it might be very painful for them to hear if they recently lost their job.