You're actually aiming for the crop, which down the right side of the bird's throat. That's the bird's right, so if the bird is facing you, it's your left. You can see the tube on the outside of the throat and feel it with your fingers running down the esophagus into the crop. It's much much easier to do and do right in birds than in mammals.
Oh, that's very interesting. I feel like in mammals the the esophagus and trachea are directly behind one another, but what you're saying is that in birds they're next to each other. That would make it much easier to tell.
Do the birds struggle much or do they kind of just accept it?