What I had trouble with at one time:
How wide to cut the binding - I prefer a wider binding than the usual 1/4 inch. It's easier for me to use the furthest left needle setting of my machine for my 'guide width' - I think mine is almost 1/2 inch wide.(2-7/8 of bias cut binding usually works for me)
As you've mentioned, many directions seem to assume that everyone wants a 1/4 inch binding - so the instructions would be better - iMO - if they said to stop the finished width of the binding away from the corner. (That's worded awkwardly - did you get what I meant?)
What/why straight cut or bias cut binding - pros and cons of each
How to join the ends - when making the binding - and when finishing it off.
When it's better to do the second stitching by machine.
What kind of hand stitching to use for the second stitching. And how to do it.
How to hand sew that corner fold down so it looks decent.
How to keep the edge turned down - glue? pins? clips?
Understanding how to fold that corner to get the miter. I had to get the book out so many times!
Should one press the binding in half - or baste the edges together - (I baste the edges together instead of pressing in half - to allow for the shifting of the fabric as it turns)
Squaring the quilt - tidying up the edges before applying the binding - do you overcast the edge before applying the binding? Do you leave the edges raw?
Convincing me to do a test run/sample to get the needle position right.