Another vote for the Bohin needle threader. I don't have tremors but am partially blind in one eye so depth perception is a mess. This needle threader works for all sizes needles, I generally use milliners needles and it threads them every time. It does cost a bit more but works so great. I also use one of the Clover threaded needle holders and just thread 10 needles at a time. Good Luck with your issue, don't give up. All kinds of resources to help you.
https://www.amazon.com/Bohin-81980-A...or+hand+sewing
https://www.amazon.com/Clover-625-Do...+needle+holder