I consider myself a very adept and confident FG maker. I have made thousands of them. By every method out there from traditional cutting triangles from templates to the two squares and a rectangle to the no waste method. Because I tend to gravitate to patterns that have FG units I invested in the Deb Tucker Wing Clipper tool. By far the best most accurate way to create FG units and well worth the small investment.
https://www.amazon.com/Clipper-quilting-Flying-Geese-Units/dp/B01H9EA086/ref=asc_df_B01H9EA086/?tag=hyprod-20&linkCode=df0&hvadid=193987317966&hvpos=1o1&hvnetw=g&hvrand=5249602080279293881&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1022672&hvtargid=aud-800640527683
la-309633260060&psc=1