OK.... I'm right-handed,so this is how I did it. Picked up the goose so it's neck was under my left arm and facing backwards,tail out in front of me. Put my right knee on the floor and sat the goose across the thigh of my left leg and pulled the bird in close to me. This frees up my right arm/hand,and with a little pressure from the back of my left upper arm,held the goose in place. Then it's a simple matter of extending the gooses right wing (I like the idea of them flying in a counter-clockwise fashion) and snipping away trying not to catch the skin. It's also a good time to check them over for mites,sexing them if ya know what to look for (I don't), et al before placing them back on the floor gently.
If you've ever sat next to the window of an airplane and looked at the flappy bits that stick out and move at the back of the wing,then that's what ya supposed to be trimming off the gooses wing......... Ree