Really useful tips – thanks!
This I discovered after a bit of “curve outside of bounds” error or the like. So for the first “frame” I’d turn almost everything off but the few features that Autofind gets right away. So then created a new frame and placed the right ear. You can grab all the dots if you shift drag over them even though it doesn’t look like anything is happening or the rectangle is off. Once I got the one ear, the other ear magically got into place. It seems it gets better at “guessing” after you add a few in the right place. But don’t try and do it all at once – do whatever is easiest to detect first and the others will be easier to orient on later frames.