The Infila Automatic Needle Threader is very easy to use.

There are two ‘funnels’ (one for small needles and one for larger ones) into which you place the needle, eye down.

You lay the thread in a gulley next to the funnel and slide the button which pushes the thread through the eye of the needle. If you want to thread multiple threads, you can do this one at a time, or all together. 

It really is that simple.