Literally you already do it without a problem. You have, and I would bet large sums of money on it, said in regards to someone well know to you “they forgot it at home” or something to that effect. You already do this without thinking, the only extra layer is that you’re trying not to get it wrong, not that it’s difficult to get it right.
Just practice some more. You still won’t be perfect but these people literally do not care at all so long as you’re trying and aren’t attempting to take their rights away. They have bigger fish to fry.
Oh, to be there when you say “they” haha
Or to watch you struggle to force yourself to say he/she so I “lose”.
It’s ok, we’ve only been doing it for hundreds of years; it’s just a passing fad, right?