The best time to do this is when snow is on the ground or when a storm is looming. Birds go bonkers when it is snowing, especially at the feeders. I hand-feed in the morning before filling the feeders for the day. Try it with Downy Woodpeckers too. I am often within inches of them at their feeders.
The birds have come to know me in the garden, so getting them to land on my hand was a piece of cake. Getting them to do it in the wild is for one to have real patience.
Either place, talk to them softly. Once they are accustomed, put food in your hand and offer it very still. They come because they are hungry, not because they like you, but it still is nice to know they can trust you.
Even though it will make you smile when they come in close, try not to. Birds look at our facial expressions for cues, and showing them your teeth, swallowing or opening your mouth can make them fearful like we are having them for dinner. I think talking to them or making birds calls is different in that they may view us as contented.
These birds are those I photograph at the Falls. They are very used to me feeding them for my photos, even following me up the wooded path back to my Jeep. It did take a while to get them acclimated to my presence though. Patience… not my strong suit.