It's so tricky to thread yarn through some needles but sometimes it's necessary. So I discovered this neat and quick way of threading yarn through a tiny eye.
Fold a piece of strong thread in half and thread both ends through the needle eye. Then, guide the end of yarn through the loop in the thread.
Pull the thread through the needle. When the yarn reaches the eye, pull the thread firmly and it'll squeeze the yarn through the eye.
Continue pulling the thread until the short yarn-end is pulled through the eye, then remove the thread and you're all set!
Works everytime :)