I have snowballed before but for geese, I much prefer EB QIAD method. You don't need her specialty rulers (sold at JAF) but I did a quilt that required over 100 geese and found her method gave me the perfect points I wanted to have. The thing that works is that when you are about to do the final trim, you can check the accuracy of the block or if it is off a bit, you can make the correct. If you have PBS on your TV, see if you can watch her quilting show. She just might also have a U-tube video.