If it is cold, and maybe a little snowy, wait til your bird feeders are empty, or nearly so. If they are located by the window of your dining room, kneel down, and open that window just enough to stick out your seed-filled palm. Use the wall as a blind. Give them two or three minutes. The chickadees will come first, and the boldest of them will land on your hand, grab a seed, go. Others will follow. As they get used to you, they will sit a little longer.
There is nothing like little bird feet on your fingers.
When you get numb, and if you have a partner or friend about, nonchalantly switch out. He may even get goldfinches interested.
Who lives life more boldly than a chickadee?